If he retires, we open a mass amount of cap space.
In that case I would immediately work on extending players now and paying most of their salary as a roster bonus this year, that would put us in amazing shape going forward.
he does not want to get traded and we don't want to trade him so that is not an issue.
Warren Sapp and AD are different players, all players are playing much longer these days as well, look at Brady
Not showing up is clear. If he wants to retire to spend more time with his kids, I would happily say, spend as much time with them as you can, and get here when you can. If it is retire or come back and play but miss OTAs and some pre-season games you would not play in anyway, that is a no brainer.