Am i wrong to think that this is the most USHL heavy draft for the Sharks in draft history?
4 of 9 picks
2017 was 3 of 6 (the first 3 picks, Norris, Ferraro, and Reedy). So less on raw amount but more in proportion. And like Orr notes above, Jake McGrew was listed as being drafted from a AAA U16 program, but that's seemingly only because he had missed all of his D0 year in the WHL. So he was a major junior dev track guy and not a pre-college one.
Other than that I think the closest you'd come would be if you broadened the net to include all NCAA development track leagues (so not just USHL but also Canadian Jr A, US High School, and US Jr B leagues) and then you might make the case for something like 2004 where 7/10 players were college track guys (though none from the USHL. But you had Torrey Mitchell, Steve Zalewski, and Brian Mahoney-Wilson playing USHS, while Jason Churchill, Mike Vernace, Dave MacDonald, Derek MacIntyre, and Christian Jensen all in various US or Canadian Jr A/B leagues.