Who says no? Who says yes? Why?
What would need to change for everybody to say yes?
Suns Get:
Collier could be the young starting PG with potential they've been searching for who's not a complete liability on defense
A small insurance policy just in case Green wants/gets a ridiculous contract extension
Collier is also younger than Green so the Suns boost their young core just in case they end up having to trade Booker after a lackluster season
Knicks Get:
To stay below the 2nd apron; owner James Dolan has explicitly stated he will not enter it
To free up money to resign KAT after his great post-season run, especially against Wembenyama in the finals
They also get to shed Hart's salary without having to attach substantial assets to him since other teams know they're trying to stay below the second apron
Dunn is a younger archetype of Hart on a rookie scale contract with some shooting potential
Bucks Get:
Hart gives them a great veteran presence in the locker room
Hart helps them stay stay mid competitively since they don't have their own picks in the new lottery system
Hart can be flipped next trade deadline to a contender once his contract is expiring if they don't want to keep him
Jazz Get:
More draft picks
To relieve the log jam at the guard spot after paying George and drafting Peterson
To not have to worry about paying all 3 guards later on and being pushed into the 2 apron prematurely