Why should the Suns do it? They get a bench scorer and a young piece who has great potential who can play the 2-4 position, especially the 4 spot where they need someone there. Evan has a not so bad contract but can be useful for a team like Suns that is contending. They give up a FRP though it might be a late first rounder.
Why should the Knicks do it? They get Jae Crowder, a scrappy 3&D player and also a big body who could fit alongside their roster. He could be their starting 3, with RJ at the two. With Thibs being a defensive-minded coach, he’ll love Jae Crowder, he’ll be what Reggie Bullock was when they were a 4th seed.