Why? Because he went 5th overall? I think it's perfectly fair to evaluate him as a 15-20, middle 6 talent. We're basically arguing which middle 6/2nd pair upside player is the top prospect for the 4th worst team......
In my head, I see Frost (marginal if you'd call him a prospect), York, Foerster, Zamula, Brink as his competition. We aren't talking high high end pieces here. Take out Frost, he's probably by default top 5.
Laczynski and Allison are old enough where I'd probably give an edge to 6 mystery box years of development time (then again, Flyers). But I admit it's plausible Allison could be more effective in his prime. Lacyznski seems destined to a bottom 6 role. Zamula, they can't telegraph harder they're not going to give him the opportunities he merits (not thicc, not Fletcher's signing). Foerster (depends how you want to weigh last year; I'm on Team Mulligan) and Brink can't skate well, but Gauthier isn't that much of a transition threat himself, and I think they're smarter offensively. That I just shrug basically says it all.
Oh, I forgot Tippett and Ristolainen and Desnoyers.