There aren't any "vs." youtube videos isolating Jalen Thompson, but you can watch him #34 in "vs. Washington State defense" videos:

He's a bit of an odd duck in terms of his role- Washington State usually lined him up wide over the offenses passing strength, where he generally is picking up the #2 or #3 receiver directly in a bunch of different disguised coverage moving from a safety-like positioning. He's almost more of a corner, or corner/safety hybrid than a true safety in the classical NFL sense.

I'm kind of torn on how the Dolphins will feel about him- In some respects I think his skill set might be really compelling to the team as a potential guy in the Duron Harmon/Devin McCourty spectrum. Someone who serves as the second free safety, some of the dime roles, etc.

On the other hand though, he might be kind of a luxury in the sense that you've got to train him to play as a center-fielder, and that might REALLY be the thing you want- you're already in a situation where the coaching staff seems to see Minkah Fitzpatrick as very compelling as a dime/slot corner and not FS, to the point where you're already maybe dislodging Bobby McCain and another guy risks basically marginalizing him.

 

I dunno, I think it's quite likely Minkah Fitzpatrick is predominantly a corner. Barry Jackson said that the slot was basically his, and that he's had some work on the boundary. I think it's quite possible they might put in the work to make sure they can scheme him as a base boundary corner- he'd work real well at the Tampa-2 stuff that they like to throw in, at least.

The Patriots seem to want to carry a SS and two FS, so there might be room despite a relative logjam right now.