Here's what it would take for each of them to be the top receiver in this draft, imo
Ridley - opportunity and a good qb. He's more skilled than he is physically talented, but he plays wide receiver very well. He's fast enough and all of his traits are good enough to be a stud - but he will need the targets. Ideal fit would be the packers, who need a technician with deep speed to replace jordy.
Sutton - good coaching and a quarterback who can overcome his skill deficiencies. He's the opposite of Ridley imo. Great athletic clay but his receiver skills are not special at all. That sounds a lot like guys like cordarelle and Kevin white. Everyone wants the next Julio so badly that they're willing to overlook when a guy doesn't know how to play the position that well. Put him in an ideal situation, though, where he could get coached up and a veteran qb could overcome his skill deficiencies, and he had the highest ceiling. For me that's the saints - put him across from Thomas with ginn taking the top off and brees using him on routes he runs well, while Payton coaches him up, and he could be a stud.
St brown - the good news is he's 6'5" and runs a 4.48 and had an awesome year with kizer at qb. The bad news is his play dropped off when kizer was gone. I've got the same kind of concerns about him that I have with Sutton, but worse. Would benefit from playing with a skilled receiver in an offense with a better tall receiver than him so he draws the second tallest corner, and he needs to be coached up/mentored for a bigger role down the road. Would be surprised if he had a fantasy relevant rookie season but he needs to get some NFL game experience. Best fit cardinals.
Moore - a little better combination of talent and skill. Not as big as Sutton and probably not as skilled as Ridley but a nice mix. Good receiver skills but got a lot of volume but on simple routes so his route tree will need work. 4.42 speed at 6 feet can cover for some of that but he will need good coaching and a good young qb to grow with. Ideal fit San Francisco.
Miller - good quickness, good head on his shoulders decent route running considering he doesn't have a lot of experience as a college starter. Would like to see him get some seasoning with a young qb and be his security blanket. Ideal fit Philadelphia.
Kirk - should cut a check to cooper kupp for making the slot sexy again. Could have the biggest year one impact of any of these guys and doesn't need elite qb play to get there. Has decent speed but better quickness, very good hands but poor size. He's the kind of guy the ravens should have been drafting all these years to fill the void from their tight ends and Steve Smith. Best fit Baltimore.
Gallup - I really like this write up.
https://www.musiccitymiracles.com/2018/3/25/17152580/2018-nfl-draft-profile-wide-receiver-michael-gallup-colorado-state
Basically everything I said about Ridley, but he's from a smaller school so he might need more time to adjust to the NFL.
Chark - he's got speed but it's not John Ross speed. He's got good size at 6'3" 200. Not a lot of receiver skills - route running, use of hands, adjusting on routes. Needs someone who is willing to chuck it deep to big fast guys. Ideal fit is the Panthers.