Absolutely no. Russell's a "me first" sanctimonious turd who has the ability to infect team culture. Keep him away from Tua. There is a reason why Denver are taking a massive $38M dead cap hit this season and next as well, just to get rid of him (and they don't have a QB to replace him). Yes, he'd come cheap and he has a big chip on his shoulder, but letting Russell in the building would smash the good team culture of last season in 10 seconds. I doubt that Mike McDaniel could put up with him.
At first I wouldn't mind it as a backup because he'll upgrade that spot since White isn't it. However, if what you say is true about the guy, then I agree ....no deal.