He has already had big seasons on a team seriously lacking forward talent in a good conference (not unlike his USHL numbers being suppressed), and that's why he should already be a top 10 prospect. Those who regularly watch him are calling their shot: he has real NHL potential -- and not just as a fringe guy. Like top 4/PP2 potential.
Kalynuk was 20 and 21 his first two years in college, which made him slightly overage, which is a huge edge in juniors and probably a substantial edge in college (or why 22 year old forwards who are top ten NCAA scorers rarely make the NHL, their success like overage juniors comes from being older, not better, than their peers).
Nor was Wisconsin totally absent of scoring forwards:
2017-18
Wagner 37g 15-18 33
Federic 36g 17-15 32 (#29 pick in 2016)
Weissbach 34g 10-16 26 (#172 pick in 2017)
Hughes (#165-2016)
And because there was no other offensive defenseman on the team, Kalynuk got the lion's share of scoring opportunities.
2018-19
you could make a much better case last year, but:
Dhoogee 37g 15-11 26
Malone 37g 8-18 26
Weissbach 27g 8-17 25
But:
Kalynuk 37g 9-16 25 0 [21 years old]
K'Andre Miller 26g 5-17 22 +7 [18 years old, #22 pick of the Rangers]
This year,
Weissbach, Dhoogee, Gorniak #123-2018, return
Cole Caufield, #15-2019
Alex Turcotte, #5-2019
Ryder Donovan #110-2019
Dylan Holloway, projected 1st rd pick in 2020
Owen Lindmark, #137-2019