It seems to me that Dilfer is talking about two different things. On the one hand, there is the offensive scheme; is it effective? Does it produce? Can it succeed in this league?
On the other hand is the concept of teaching; are the coaches good teachers? Do they instill good habits? Do they effectively communicate the scheme to the players?
I see these as two completely separate things, but he is implying that they are somehow the same. I'm not sure if Roman and friends are good at both, but it sure seemed to my untrained eye that he was doing a pretty decent job of both.
I can see how some (such as dave, and I guess Dilfer) believe the scheme will not produce high-level success in this league, but I think that remains to be seen.