Of course it would work. You're over thinking this . . . and yes, Garnett can still defend the pick-and-roll.
According to Wojnarowski, he wants to play one more season.True, but if Garnett retires at forgoes his entire salary (like Kidd did, although that's rare), then the Celtics may think it better to just let him go and save money rather than taking on another pick and paying $5 Million. It could really depend on if they like whomever falls to the Spurs' pick.
If Bonner would agree to extend his contract past the deadline, then they could offer him, along with the 1st and keep Diaw. If Bonner wouldn't agree (hard to imagine, since it is essentially home), then just replace him with Diaw and retain him.Funnily enough, I was wrong. Garnett makes about a million more than I thought he did, and that makes his contract to big to match with Diaw and Bonner. If Bonner agrees to extend his deadline like some have suggested, then that would allow a Diaw and Bonner for Garnett deal to happen when the trade rules reset. While that might not seem worth it, since the Spurs will have cap space by that time anyway, it would allow the team to use cap space, THEN make the trade. So I'd prefer that.