This one is easy. It is the now-New York Jets wide receiver Denzel Mims.
I wrote up exactly why he was one of the most confounding prospects in the 2020 NFL Draft
here, but the gist of it is that his Senior Bowl tape was vastly different from his game tape at Baylor. Mims struggled to separate on what was an admittedly limited route tree for the Bears last season, with 41 of his 113 targets being contested.
Then, at the Senior Bowl, with a little more freedom and on a number of different routes, Mims was easily the highest-graded receiver in the one-on-ones. It's not too dissimilar a storyline to 2019's highest-graded receiver in the one-on-ones: Terry McLaurin. With similar 4.3 speed, can Mims see early success in the same way McLaurin did?
I haven't the slightest clue what the answer to that question is, which is why Mims is who I'm most looking forward to watching.