I don't see him as "massively successful" at Navy. I think he was moderately successful. If my math is right, he was 15-21 against P5 teams. And that's been the biggest (or at least, one of the most often cited) issues ... is that his approach to the game doesn't work well against P5. And he said his point was to prove it. Did he? It would be a fun analysis ...anyone can beat Alcorn State. Can he consistently beat P5 teams? You might be right ... need to look at the data.
That said, CPJ was a good fit at Tech for a time when we needed it. I would not put him in the same class as the giants of the game such as Bryant, Saban, Holtz, etc.