I like JSN, just don't know if I like him for the Cowboys.
The dude just gleams with polish. He breaks CBs' ankles on his routes, he finds holes in zones, he works back towards his QB and bails him out on bad throws, he blocks on screens... honestly, he looks like an NFL vet already. Dude only had 1 year experience in college, I get that, but he's so fundamentally sound that I wouldn't worry.
His main problem is that he's a one-gear player. When OSU threw to Garrett Wilson or Chris Olave, there was such an obvious difference in explosion. JSN is simply not that big and not that fast. I would almost say he's on the CeeDee Lamb spectrum, with CeeDee's marginal height/weight/speed and natural feel as a receiver. But Lamb always had an element of dynamism to his game at Oklahoma, with insane 1 handed catches and big YAC plays. JSN just never really takes it out of second gear.
I think he's a slot only in the pros. He's got good football player written all over him, and IMO there is zero chance he sucks in the pros, so I couldn't hate a JSN pick. But we've seen for a couple years how having a WR corps of nothing but medium-build 4.5 guys can really limit what we do on offense.