Expecting Metcalf and Hockenson to be gone the only guys I can come up with are:
Noah Fant has the size and speed to be a serious matchup problem, too fast for lbers, too big for dbs.
Marquise "Hollywood" Brown from Oklahoma is a poor mans Tyreek Hill. And after the Monday night slugfest against KC maybe McVay started to envision what an explosive weapon like Hill could do in a McVay offense. Dude is only about 5'-10" and 170 lbs so he is limited, but just get the ball in his hands. I think he is a second rounder so there's that issue as well.
Parris Campbell from Ohio State is not quite as dangerous as Brown, but is a bit bigger at 6' and 205 lbs. And probably a third rounder.
Deebo Samuel from South Carolina is the most physical of the 3 wrs, but not as explosive. He's a swiss army knife type than needs to be in the slot. 2nd rounder.
There are just no real HR hitters as far as RBs, but if you could get Justice Hill from Oklahoma State in the 4th round, you could get a dual threat weapon that is at his best in space.
I'm not saying im for or against any of these guys, but for your scenario, these make the most sense to me.
Don't waste your time looking back, you're not going that way. - Ragnar Lothbrok