Yeah, for me it's the evaluation piece with Flood, specifically on the interior.
I'm not sure if he's a bad coach/teacher. He got Christian Jones, Jake Majors, Hayden Connor, and Cam Williams all drafted. Each of those guys had their flaws in college (and it would be fair to say Flood never fully rectified them), but none of those guys were the home run prospects that Kelvin Banks was and he got them drafted/on NFL rosters. Can't take that away. But the only evaluation of his there is Cam Williams, and he's OT all the way. Campbell, who I assume will be a late round flyer, was similar to Banks in that he was a 5 star that could have gone anywhere, so I don't think he gets too much credit on that. Beyond that, what we've seen of Flood's evals on the interior has mostly been bad. Hutson, Stroh, Neto (who we haven't really seen that much of, but he's ether worse than those two or Flood can't see that he's better), etc. From a roster management standpoint we're also very thin at OT, one injury away from having a really bad time.
Even if he is a functional teacher of the position in practice he is clearly a failure when it comes to evaluating talent and managing the OL roster.