Mentoring is a nice idea - like a father teaching his sons. But if JJ were brought back, and I were him, I'd do my darnedest to keep the young guys behind me on the depth chart, not help them win my job. Vets do not get paid for the mentoring, they get paid for being on the roster during the season.
Mentoring rarely happens, because you have to be 100% sure about job security to be able to do it. Arod can mentor his backups, he's not gonna get replaced. JJ can not.
Torry Holt, when signed as an old, stop-gap player in Jacksonville, was asked if he would mentor the young players. His reply: “Yeah, I’ll mentor them all the way to the bench.”