He's also bigger, faster and longer than pretty much every CB he will go up against. He doesn't play to his 40 time on his routes, but with the ball in his hands, he can.
Last year, the size/speed monster in the draft was DK Metcalf. I just flipped on a Metcalf highlight reel from last year in Seattle. Metcalf isn't wide open in most of these catches (at least for the first 2 minutes I watched).
https://www.youtube.com/watch?v=7GfbbrHfEtQJordy Nelson wasn't a monster at getting separation, but if you threw 1-on-1 to him in the red zone or on a deep ball, he was likely to make those plays for Aaron Rodgers. And on shorter passes, he could use his size to box out defenders and make plays.
He will need time to develop as a route runner to reach his full potential. But in the short term, he can be an effective deep threat and red-zone threat.
If Mims were 5'11" and relied on making plays in traffic, I would be more concerned. Obviously, Mims has bust potential. There are some Stephen Hill vibes to his game, but there are also some Metcalf/Nelson/Braylon Edwards.
