I'm real ambivalent about KD and Irving.
As for NYC matches:
KD is prickly, which dates back to his OKC days
Let's engage in some fantasy talk. In this fantasy: Assume KD is coming.
What we know for certain: AD wants out of New Orleans. The Knicks (and others) are interested.
What we know with high certainty: Zion and RJ are tight.
What we know with some certainty: Zion's reaction seemed blah about New Orleans.
Do we make an offer for AD that includes the #3 pick, Mitchell Robinson*, Knox, and the Dallas picks plus whatever salary filler? *love him but AD means Mitchell plays less as we don't know if they can play together. Also Knick rookies don't have great Sophomore track records.
From New Orleans side, they give Zion a familiar buddy (who was only the Nations #1 prospect 9 months ago) and improve his happiness and get a potential mini-AD replacement. Plus picks. I think that is more attractive that other offers because no other team has Zion's friend and a young center that does some of what AD does (at least on the defensive side of the ball)
For the Knicks, you have Durant and AD. You still have all your young guards. You don't need Kyrie. Kyrie would take minutes from all the young guards and still be the third best player in that KD-AD-KI configuration but have the ball in his hands to start every play. Not the most efficient way to run an offense to maximize the effect of KD and AD. What is wrong with KD as our primary playmaker. He won't want the responsibility all game, but in the last five minutes i would like to see him start the offense and either find AD or take it himself.
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OF course this fantasy falls apart if KD won't come. Unless Kawhi likes the idea of pairing with AD here it won't make sense to trade for AD alone of another Superstar coming in Free Agency.