Just want to reiterate that if the Suns trade for KD, they'll be depending on two star players who are injury prone and will miss games for load management. They'll lose Ayton, Bridges and Johnson as quality starters who were on rookie-scale. They already lost Javale and will have very poor depth in the frontcourt. They'll be capped out. They won't have their draft picks. They'll be in the luxury tax when Booker's new extension kicks in, if not sooner, so they'll have very little flexibility. Their owner is already known for being cheap, as evidenced by not extending Ayton or Jalen Smith. He's nothing like the Warriors' owner. They might not win more regular season games than the Warriors, Clippers, Nuggets or Grizzlies and are not guaranteed to be a homecourt playoff team. If they lose in the 1st or 2nd round, the whole experiment could blow up.
The only reason Ainge would trade Mitchell for a package of PHX draft picks is because he thinks those picks are going to be very valuable. That's why their package could be as attractive as the Knicks. Ainge would be setting them up like he set up the Nets in the Pierce/KG trade.