It's not like that. From what I've seen and read, JJJ seems like... a nice guy. A beta type who will always defer to a stronger personality. In Memphis, that was always Morant. Jackson was an overpaid Robin to his Batman.
What I mean with "baggage" is that he'll bring with him the style of play that unfortunately made him a two-time All Star. Guys are not really going to change their games later in their careers when that happens.
The trouble is that it's very difficult to integrate his black hole, back-to-the-basket, ball stopping tendencies to a modern NBA offense. Lately, the Grizzlies have been trying to play at a faster pace, moving the ball, and it was clear JJJ was just confused by it, floating out on the fringes of the offense. He didn't know where to be or what to do if he didn't get his trusty, outdated low post touches.
Hardy has his work cut out for him. Our offense has looked really good with space and movement and both Lauri and Keyonte thrive in an environment like that. JJJ, on the other hand, needs spacers around him and a static offense. We'll see who gets the "parked in the corner" assignment.