I think he took Elam pretty early if my memory isn't too faulty. It's not like he took him because there wasn't any talent left on the table and it was January and he needed numbers. That was the class with Kyler and Daylon so there was plenty of momentum to capitalize on. I feel like he often targets these long/tall guys that can't turn and go and then they have to position switch players to meet numbers at either CB or S. (Williams for you guys, UNC, and ND all had that happen under him).
The thing is Joseph is a good recruiter. He's a really nice guy and connects well with recruits and their families. I'm not a fan of his evals or his dated coaching style, but he can recruit, connect, and close. So I think he simply did prioritize the wrong guys like Pryor, Dunning, and Elam in that one class. Notably he pursued Pryor and Dunning over DeShon Elliot (as well as Houghton, PJ Locke, McKinney). Pryor and Dunning both turned around like a tractor trailers and both were going to need to spin down at the next level. You can't take both of those kind of guys in the same class or you cripple the room - which of course is what happened. The next year they took the same basic player in Okeke - who predictably moved to LB almost immediately. I liked Oliver a lot but Fuller was another guy who didn't profile at CB (couldn't turn and go) and his career bore that out. Watts was a McKinney recruit as was Harvey but Wilson was an excellent job by Joseph. Thats' a pretty rough rolling 3 year group.
His one year at UNC they only took two DBs - a 6'3" DB Caleb Rozar who can't turn around, they tried him at CB and he's now at Pearl River CC. The other, Tre Shaw, entered the portal after not cracking the 2-deep. UNC had to take 4 portal DBs on top of their high school recruits to try and replenish the room before Dre Bly's recruiting kicked in.