I find it surprising if this guy is truly available...
True. It doesn't seem likely.
I think we should keep in mind that we have to trump the best offers out there.
"Best" meaning: what Chicago needs. Because trading Butler means they're blowing it up, so they'd need draft picks or young players.
Would you trade Smart, Crowder , and the 3rd pick for Butler and McDermott? Ooh we'd have to add Amir to match dough right? Eek.
Would either team do this deal? Am I overrating Butler?
No, won't have to match salaries unless they're over the cap. And no, I wouldn't do this deal. Better to offer more picks than give up either of those guys. The Celtics are now in the phase of building a contending team, not just acquiring talent. They should try to keep their best players - this seldom happens, of course, but Boston's asset collection is unusual; they could likely trade for a top player using only draft picks and non-core players, and then sign another in free agency.
Crowder had a breakthrough season and makes a substantial contribution on both sides of the ball. Young Marcus had a rough start what with the injuries, but the team has to be delighted by his progress. He's a potential stopper at three positions (they had him on Millsap some of the time!), has great instincts and anticipation, and began to show some success at a penetrate-and-dish game, including in the playoffs. He's got the poise and lower body to take contact and finish in the paint.
Imagine Crowder/Butler/Smart on the same team. Tough, physical, quick, young.