Funnily enough, I actually wouldn't be opposed to getting Jeff Green back here.
When we traded him away we were a decent lottery team trying to reduce ourselves to a poor lottery team for the sake of draft value, but then we surprised people and ended up making the playoffs.
I don't think Jeff Green is very useful on a tanking lottery team, but he could be very useful on a playoff team - as a starter or a bench guy. Out biggest weaknesses (aside from rim protection) is talent at the SF spot, and outright scoring in general. Green would help us in both regards, and would also give us a solid defensive option against guys like Lebron.
Plus the addition of Isaiah Thomas and (hopeful) emergency of Marcus Smart means he doesn't have to play as large a role in facilitating the offence (which he sucked at) and can fall back to his more comfortable role of being a 2nd or 3rd option on offense.
Then throw in the fact that we are now much more of a running team now that Rondo is gone (which fits him perfectly).
I actually think Jeff Green would be an awesome fit on this current team.
Yeah, I know I'll get flamed for this post lol but oh well