FWIW, we need to be careful where we get info from, as there are a range of heights and weights provided for players and its not easy to find the source or . Looking at the BU website (which is probably a pretty decent source), Quinn Hughes is 5'11" and 176lbs. and Lane Hutson is 5'10" 162 lbs. So I'm not sure you have the information to draw those kind of conclusions.
And is there a particular reason why you're pushing this +20/ reach 180 lbs narrative? If Hutson is successful or not at the NHL is going to be based on how his unique play translates, not his weight. That's the case with Spurgeon, Hughes, Fox, etc. He needs to add more muscle for other reasons, but there's not a magic number that will mean he can or can't be effective.