Yeah, that's the moment when people start to overthink things because they're bored of having consensus no 1 pick. Zion fits Suns well - he has potential to be difference maker on D (they're lacking that a lot), and potential to become facilitator of offense with his playmaking (that's perhaps the most underrated thing about Zion, that wasn't on display because of Duke's lack of spacing but he's clearly a good passer), and that's another thing they're lacking because Booker seems to be just fine secondary playmaker. Suns won't have spacing issues either if they find a good shooter on PG spot (Bridges, Booker, Warren).
On the other hand, while Morant would be good fit for Suns offensively, he's also awful defender and I don't think building around Morant-Booker duo in modern league on perimeter would be that good idea considering that would be potentially the worst 1-2 duo on D in a league, while also having Ayton in the back as rim protector.
The only issue with Zion in Suns would be Zion-Ayton fit. While on defense Zion is a great fit for Ayton because ZW has tremendous defensive awareness what is obviously a thing that Ayton is lacking, on offense, Ayton even this season underperformed because he was mainly used as a finisher, but because of Suns' playmaking issues, his offensive usage wasn't as big as perhaps it should be. He has potential to stretch a floor on midrange very well, but if you ask me who's the player I want to give a ball on low post, and generally who's the player I want to give a ball on Suns team - that's definitely Zion in this case.
Generally speaking, despite terrible season, Suns have talented roster, but because of their players limitations and obvious holes in roster, it's very hard to find really good fit for them on both sides of the floor. They're quite like Cavs without LeBron before he came back, and during 15-17 runs. But Zion is just so good that you build everything around him, and not taking care too much about a fit, while I still think that it's actually a good fit to match him with this Suns team.