To me, Kupp is a deeply entrenched student of the game, and hyper committed to being the best WR he can be
That trait, his trait is part of what Snead and McVay are being praised for seeing
As for Van?
As prepared for the next level as Van might have seemed, I do think there was an entire level of knowledge base that he had to ingest
Both of these guys are coaches sons.
But I think that Kupp had a larger chip on his shoulder, and was obsessed, is still obsessed with staying at the very top of his abilities.
Van came from a big school,
Kupp did not
I think that part of why Van hasn't had the attention of snaps on field may relate a lot more of what's between the ears than what's going on on the field.