Kyle Hicks does a terrible job of using the block, but this play really shows how Collins' speed shows up on tape. It's not an open sprint, but he's motoring. If Hicks runs off his hip, he at least falls forward for two or three more yards. I don't know how common mistakes like this are from Hicks, but he does look good in the open field.
Anyone know how old Collins is? Can't find that info anywhere.
If he's 22 or 23, I'd feel better about his prospects of putting on 5-10 lbs of good weight (one of my primary concerns with Bolles). His arms are short for an OT, BUT they're not much shorter than Taylor Decker's (33 3/8" vs 33 3/4"). If Collins can bulk up a little, I'd be OK with him as an emergency OT. I like Collins build better for OG, and I think he can start and has a pretty high ceiling inside, but I think he can get it done at OT in a pinch in the NFL - assuming he's able to add that weight. So, if you view him that way and think he can add weight, that's added value.
Your point about upper body strength is a good one. That also shows up on tape. When he gets his hands on someone, it's usually game over. This play isn't especially impressive, as the defender isn't putting up a great fight, but I think it shows how easily he can control someone.