Whether it be age Gary Jennings Jr. Jersey , a new offensive or defensive system or simply a change in finances that snuffs out the fire, statistical drop offs happen every single season. Injuries can be a huge hamper to performance, but so can additions to the depth chart. A starter can suddenly be marginalized by a younger, better player that usually costs a lot less to keep on the rosterIt certainly happened last season Ugo Amadi Jersey , with Adrian Peterson finally wearing out his welcome with the Minnesota Vikings, Ryan Fitzpatrick fitzing up his future with the New York Jets and Tony Romo barely play a few downs of regular season NFL football at all. Did you take Jeremy Langford early in your fantasy draft only to see his carries go to rookie Jordan Howard? Cam Newton came into the 2016 season as Superman and ended it as Bizarro.It's why depth at every position is so important. It's also why teams that don't plan ahead to that next era are usually so quick to fall to Earth. A team not only needs the guy at a particular position, they also need the next guy in case the star goes down, flubs up or just gets fat Devin White Jersey , old and lazy. So, with that, here are my picks for 15 NFL players who will definitely decline this season. Think of the best athletes that you’ve ever met in your life. There’s a good chance that they had athletic parents with monstrously sized fathers and speedy mothers. Some athletic ability can be learned, but a lot of it comes from the bittersweet world of the genetic lottery. You would think that if one sibling has success in the NFL L.J. Collier Jersey , that he would have a brother that could succeed just as much, but that hasn’t been the case.Sure, there have been pairs of brothers that have had a lot of success in the NFL. Just look at siblings like Ronde and Tiki Barber, Shannon and Sterling Sharpe or Vernon and Vontae Davis. Oh Johnathan Abram Jersey , and there are those two Manning brothers that have combined for four Super Bowl championships, 18 Pro Bowls, 116,127 passing yards and 833 touchdowns. That’s not too bad Maxx Crosby Jersey , I guess.For each pair of brothers like that, there are plenty of siblings that have only had one stand out while the other never got recognition. Of course, you have brothers like Chris and Matt Simms or Josh and Luke McCown where neither one seems to be heading to the Hall of Fame. Let’s take a look at the unlucky siblings that have to be reminded of their brother’s success once again as we discover the top 15 NFL players that were better than their siblings.