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There is this notion that veteran NFL players mentor the younger guys and to some extent that's true. The exception comes in when it's their backup, and the reality is, there aren't many guys that will help someone take their job.
I remember when some fans were upset to find out that Brett Favre wasn't mentoring Aaron Rodgers when he was still the starting quarterback for the Green Bay Packers. What it boils down to, is that the more tips you give your younger back up, the more you are aiding them in over taking you on the depth chart. It seems selfish from the outside of the situation, but think about it, would you willingly train someone to take your job?
I didn't understand this before I got to the league, but it made perfect sense as my career went on. You have competing interests as a professional football player and that's just an inherent part of the game. For the team to win, every player needs to be there best, but for you to continue to have a job on that team, you also have to continue to be the best option for your role. Whether you're the starter, a back up or a special teams player, once a younger guy has over taken you ability wise, the team is going to show you the door.
That doesn't mean you can't pull for your teammates, but pulling for them doesn't mean you have to teach them all of your tricks of the trade. If they are smart and you are above them on the depth chart, they will be watching you closely anyway, if they aren't, then it's really not your problem.
At some point every player has to leave the game and most aren't ready when that time comes. Something I learned from being in the NFL is very few players speed that process up by mentoring the guy behind them.