It's no secret that Book or KD will be traded after the end of the season.
Magic needs a scorer alongside Banchero and Franz to decide in moments where experience is needed, Booker is the ideal option, an excellent scorer, a good 3-point shooter, a guard who is not short, is not so bad defensively and has a good exchange value for Magic. Of course there could be better exchanges, but I think it would be a nice and good Orlando team to compete with.
Suns get a young player (Tristan) who shoots well for 3 points, and two players with good values to be exchanged or used in the team, whatever their objective.