Hall of Fame quarterback Dan Marino has filed his own NFL concussion lawsuit. Marino, along with 14 other players, filed the lawsuit on May 28 in the U.S. District Court for the Eastern District of Pennsylvania. Marino joins a little under 5,000 retired NFL players and their families that have sued the league across approximately 225 concussion lawsuits. There have been many notable players that have filed lawsuits, including Tony Dorsett, Eric Dickerson, Mark Rypien, Tony Mandarich, Art Monk, Jim McMahon and Jamal Lewis, as well as the estate of the late Junior Seau. None, however, are as well known as Marino. The key allegation raised by Marino is the NFL concealed information. He is arguing that the NFL knew of the long-term neurological impact of headshots but failed to share those findings with the players. This issue of fraudulent concealment was also alleged in the other concussion lawsuits so its not new. Its tough to know if Marino will succeed as everything turns on the evidence presented at trial. To win, he will need to show that the NFL had key and important information about the long-term and devastating impact of headshots and concealed it. The NFL, however, has certain defences available to it. First, it can argue that players were aware of the risk associated with playing football and they agreed to those risks each time they stepped onto the field. The NFL would also maintain that they didnt conceal anything. As well, the NFL could point out that no one can say for sure what caused a players dementia, and even if it was caused by repeated headshots while playing football, how much of that damage was sustained outside the NFL in places like college or high school ball. So what caused the dementia and when it was caused become key issues. The NFL can also argue that Marinos lawsuit doesnt belong in court in the first place, but rather should go to arbitration. The collective bargaining agreement provides that issues of player health and safety go to arbitration and not court. On the flip side, Marino would argue that since this case involves fraud in the form of concealment, it properly falls outside of arbitration and within the jurisdiction of the courts. Bottom line is this: both sides face challenges in this case and thats where we generally see settlement. All this is probably moot, as the league is working on finalizing a global settlement of these cases. You may recall that back in July 2013, the league announced it had settled the concussion lawsuits with the players. The negotiated settlement was for $765 million and would bind every retired NFL player, of which there are about 19,000. You should note, though, Marino is included among these players. So that means that Marino didnt need to file the lawsuit at this time. As well, while settlement was indeed announced, it was not finalized. Before the NFL can consider the case closed, the Court has to approve the terms of settlement. The problem is that on two separate occasions the Court has rejected the settlement on the basis that there is insufficient money to pay all players. As well, even if the Court were to approve the settlement, any of the 19,000 players would have the option to opt-out of the settlement agreement. If a player believes that he can do a lot better filing his own individual lawsuit, he would tell the court and the NFL thanks but no thanks, Im headed to court. The Marino lawsuit may suggest that he is tired of waiting around for a payout from the proposed settlement and wants to take matters into his own hands. Whatever Marinos motivation, these concussion lawsuits are likely to continue for years. In the event a global settlement is approved by the Court, it seems likely that a number of players will opt out and file their own lawsuits. Indeed, there is still a lot of track to cover. 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Hes near the bottom in several passing categories and some are wondering if Mark Sanchez should get a chance to start for the Philadelphia Eagles.Not coach Chip Kelly.I think you rate your quarterback in terms of, Are you winning, are you losing? Kelly said. Nick is 5-2.Foles surpassed all expectations in 2013 when he came off the bench in Week 5 and put together one of the best seasons by any quarterback in history. He threw 27 touchdown passes and only two interceptions, setting an NFL record for best TD/interception ratio. He completed 64 per cent of his regular-season passes for 2,891 yards and his passer rating of 119.2 was the third-highest ever. He tied an NFL record with seven TD passes in his ninth career start at Oakland on Nov. 3.Overall, including the playoffs, Foles tossed 29 TDs and only two picks in 350 attempts and finished off as the offensive MVP of the Pro Bowl.Things arent going quite so smoothly for the third-year pro. Foles already has nine interceptions and hes lost three fumbles. His completion percentage (59.2) and his passer rating (80.7) both are sixth-worst in the NFL.I have to do a better job, Foles said. Words cant describe it. I have to keep working on fundamentals, footwork and decision-making. Im going to keep studying film and keep working. Its all correctable and I can fix it. My words dont mean anything. I have to go out there and prove it.Foles threw two picks in a 24-20 loss at Arizona on Sunday and misfired on three straight passes from the Cardinals 16.Its a concern when we turn the ball over, offensive co-ordinator Pat Shurmur said. Weve got to correct the errors that we make in terms of turning the ball over, and again theres a reason for it. And were just going to have to just continue to try to improve it, and I think thats really it.Kelly woulddnt put all the blame on Foles.ddddddddddddI know weve thrown nine interceptions, but theres not a consistent (thing), he said. Sometimes its the rush, sometimes we werent running the proper route, and sometimes its the quarterback.Foles threw one interception against Arizona off his back foot instead of getting set in the pocket. Hes only been sacked twice in the past six games, but hes made risky throws to avoid the rush at times.What Im finding with Nick is when he sets his feet and steps into the throws, hes awesome, Shurmur said. What were also finding is there are times when he gets flushed or he flushes himself and he doesnt have his feet underneath him and hes not as good as he could be if they were, and I think that can be said for all quarterbacks. When we do flush, weve got to remain a passer.There are times when an incomplete pass is really the right thing to do, Shurmur said. But as a passer, if you can stay in the pocket, trust the pocket, theres no reason to flush, go through your progression, as the down gets late, then you stae right thing with the football.The defending NFC East champion Eagles are only a half-game behind Dallas (6-2) in the division and still have two games remaining against the Cowboys. Though Sanchez, the former New York Jets star, excelled in the preseason, he wont get a chance unless Foles is injured.NOTES: C Jason Kelce practiced with the starters, just one month after having surgery for a sports hernia. Kelce has missed the last four games. ... RB Darren Sproles also practiced after missing one game because of a sprained knee. ... CB Brandon Boykin and S Nate Allen didnt practice because of hamstring injuries. ... The Eagles visit Houston (4-4) on Sunday.___AP NFL websites: www.pro32.ap.org and www.twitter.com/AP_NFL___Follow Rob Maaddi on Twitter: https://twitter.com/AP_RobMaaddi ' ' '