Decent talents all around, but we CAN & MUST do better. Specifically, I'd like to see Nerlens Noel and Danilo Gallinari brought in. You'll have to add in guys ultimately for trades, but Ainge has built the ammo to do just that. Getting Denver & Philly to bite is the problem.
I.E.
Lee, Young, + Celtics own 2016 1st round pick to Denver for Danilo Gallinari.
Avery Bradley, Jared Sullinger, Brooklyn 2018 first round pick + Minnesota's 2016 2nd round pick to the 76ers for Nerlens Noel.
If Turner & his expiring is kept with nothing available in trade, you have:
IT/Smart/Rozier
Crowder/Smart
Gallinari/Turner/Hunter
Olynyk/Mickey/Jerebko
Noel/Johnson
Turner and Smart can of course fill in the 2 guard spot for Crowder (if he can't go there), & you'll have Brooklyn's pick next year (Bacon, Brown, Murray) to hit on a shooting guard for the Bradley upgrade, while Turner & his contract expire.