Determining who gets better in the short term depends entirely on IT's hip and if he can replicate his production from last year. IT had a monster year last year, probably better than Kyrie did. It's not out of the realm of possibility that at least for next year healthy IT and Kyrie are a wash. Long term if the Celts can get Kyrie to buy in and resign though, he fits in better with their young players/assets.
I agree. To be fair, getting Crowder would be pretty huge for the Cavs. Think of the minutes they had to fill last year and how they had to stretch Lebron especially defensively.
And for the Celts, they have elite young players ready to fill Crowders role.
Apart from the trickiness on both sides of potentially aiding your largest short term rival in the East, the parts involved really do make sense for each side.