The likely reason IMO anyway there hasn't been a ton of trades is they have to negotiate a new CBA this year. Remember last time the season didn't start until Christmas. So we'll have no way of knowing if Kyrie will remain in Dallas until the CBA is signed, and they can change any of the rules as far as the salary cap or anything else.
https://www.forbes.com/sites/bryanto...h=2f2c14cc77a9