Collins makes me really nervous for a few reasons.
1. he is a legit trade target, I can 100% see DA trying to land him. He fits a need on the roster and is on the Jays timeline
2. Can the Cs afford to pay him a near max deal and still construct a bench in the future
3. While he is likely to start as a traditional PF next to Theis or R Williams ( I would move TT if Collins is brought in) he is more then likely going to have to finish the game at the 5. I'm not confident in his ability to defend in high leverage playoff situations.
For Collins to Boston to work I think the Cs would have to move Kemba in the offseason. For both financial and in game reasons. I would like to see a superior defender then Kemba added to round out the new "core group" of Tatum, Brown, Smart and Collins. This trade idea involves to many teams to be plausible but this is the type of roster construction I would like to see around a Collins trade.
https://tradenba.com/trades/2HgSpzuic* not a good deal for Dallas but it works with my idea of adding creation in the form of a capable defensive wing.