I'm assuming Reid opts into his player option to allow the Timberwolves to trade him. On his side, he has also negotiated a sincere extension with the Suns—after all, they were the first team willing to offer Butler a contract.
I think after the Second Apron rules were introduced, KD's contract is too large considering the Suns' asking price.
If KD goes to the Jazz, he could opt out and re-sign at a lower salary, making him more appealing to other teams. Then, they could trade him midseason.