First, Tatum apparently wanted to play for the Celtics. Jackson obviously didn't.
Second, Celts need scoring, already have a bunch of great d, high energy, can't shoot guys.
Third, maybe it doesn't matter that much, but Tatum just seems to be a better person. Know I shouldn't make judgments, but listening to him, he seems like a genuinely nice kid. Jackson has had his issues. Not branding him for life, but at this point in their lives.
All in all, I'm good with the pick. I think he'll fill a need.