I don't know if I watched the right player after readying this report, but I tried to watch Oklahoma fullback Aaron Ripkowski and what I saw is a guy that's good at normally sealing a guy off by making him turn his shoulders like FB Korey Hall used to, but no real drive bull power block like that of Quinn Johnson.
And while maybe not used as an H-back a lot in college, he looked like he has the route running, body adjustment skills and hands to be a good target in the passing game and some power when he runs with the ball. Looks more like an H-back than a FB to me.
This 2nd video is of Blake Bell (which distracts from Rip) but you get to see a lot of
#48 FB Aaron Ripkowski playing both H-back and FB, and I think he's much better as an H-back than a FB.
1st play runs straight and just pushes a DB
0:21 just runs behind the line and lightly hits a guy
0:30 very good kick out of a DB
2:05 He runs up the middle like a FB, not really getting his guy
2:23 Run blocking runs into a DL and guys no push or block really
2:31 runs down but again not much push
Point being watching him, he looks more like a power Korey Hall sealer H-back type to me than power FB like Quinn Johnson. You see him run over guys more with the ball in his hands than as a blocker, as a blocker he seals guys out more than over powers them.