In addition to his height (6'3) and length (33" arms), Ahkello Witherspoon moves really well. His burst is apparent, but his balance and poise are underrated. He plays like a CB who trusts his tools. He's not perfect, but when you have his combination of length and burst, with no real weaknesses (he's not a straight-line athlete), and you trust it, you're poised to play well in the NFL.
He never loses position on John Ross here. Later in the play, Tedric Thompson comes over and interferes with Ross, but Witherspoon stays in his hip. Ross, of course, ran a 4.22 40, and in case we forget how quick/explosive he is, this is Ross hurting Adoree Jackson's feelings:
Adoree Jackson is a very nice prospect, with high-level quickness. He may have let his guard down a bit on this play, but it's still impressive to see Ross work him like
this. The play resulted, of course, in a TD. It makes Witherspoon's ability to stay with Ross even more impressive.
I really don't see this skill set lasting until the 2nd Round. Because he moves so well, he's not tied to teams that typically prioritize that kind of length (Seattle, Carolina, Cincinnati, Minnesota, Miami, etc.), but those teams will still love him. He needs to up his aggression and technique as a tackler (this is the key issue for him), and though he broke up 19 passes in 2016, there are times when he doesn't get his head around as quickly as you'd like. This is something that can be improved, and his instincts look good. Improvement in this area would also increase his INT total. His long arms, big hands, and plus coordination should lead to more INT's in the NFL.
These are the spider charts for Ahkello Witherspoon and Richard Sherman (Witherspoon's closest physical comp, according to the site).
Witherspoon is much further along than Sherman was, but he doesn't appear to have the dog in him that Sherman did/does. Still, Witherspoon's upside is clear. His floor will be tied to his tackling. I don't see him as a soft player, outside of tackling, so with technique work, and considering his athletic talent, once football is his full-time job, I think he'll tackle with more confidence and willingness. Seattle typically waits on CB's, but with teams biting their style, I could see them loving Witherspoon (Kevin King is another they probably like a lot).
https://www.mockdraftable.com/player/ahkello-witherspoon
https://www.mockdraftable.com/player/richard-sherman