In an ideal world, sure, it'd be great to have a Kucherov on the top line. In the real world however, where scarcity and limited resources are actual concepts, the much, much bigger priority should be finding a second or third line right winger to upgrade Frolik or more critically, Hathaway.
It's myopic and patently unnecessary to focus getting Gaudreau an offensive bump when he's already on pace for 92 points with Ferland as the top line right winger for the vast majority of the season. As for Monahan, it seems like he's always going to be between 60 and 70 points regardless.
Teams need at least three scoring lines to be successful to today's NHL, not one or two.