He would be a spot up shooter we'd love to have. And he would probably benefit a lot on the defensive end with this team.
He also wouldn't be expected to be TMac on this team anymore

On the other side of things, if this were a trade, (I'm not even sure if GG for TA would work under the salary cap) Dallas would get a slasher off the bench who can play some solid D and has already played legit minutes on a championship team, more than you can say for Green.
I guess what I'm trying to ask is, would you rather have Gerald Green on our team rather than TA? And would he be a good fit?
I personally think so.