At best this is an offseason type trade, or a not-Brad-Steven's-team type trade, or a 1980's offseason type trade.
It's all about the playoffs. Depth is important in the regular season, but it means way less in the post season. It's usual for teams to go with an 8-man rotation.
Kemba (36) - Smart (12)
Brown (36) - Smart (12)
Hayward (36) - Smart (12)
Tatum (36) - buyout PF/Semi/G-Will (12)
Turner (36) - buyout C/Poirier/R-Will (12)
I'd be perfectly happy with something like that, especially if we could entice a guy like Tristan Thompson/Derrick Favors at the C position. Worst case scenario, we can always sign Keneth Farried. He wasn't half bad last season with the Rockets averaging 13 points and 8 rebs in 24.4 mins of playing time. His defense sucks, but he's a good rebounder + pick n roll threat. Fwiw, Noah, Amir and Zaza are also free agents.
Anyway, I believe Moranis is probably right. Chances are that Indy/Washington can find better offers for Turner/Bertans.
I don't see why Indiana does it nor any of the potential 3rd teams he mentioned
If we really want Turner, we gotta sacrifice one of our core guys. For instance, Smart + Langford for Turner. Not sure whether it would be worth it. I'm a big fan of Smart's game. Him and Brown are my favourite current Celtics. But then again, you have to lose something to gain something. That's how trades work.