You've had some great posts the past few days, but I'm just going to go with the tape. It doesn't have to be the players or the coach. It can be both, the coach and the players the coach brought in.
A defense that can't stop the run or pass, can't tackle, catch up to or cover people. That cannot stop an fcs offense. That can create their own blooper reels on a weekly basis
An offensive line that can't move an fcs defense off the line of scrimmage. WR's that can't create separation except for the occasional broken coverage. And I won't even mention the QB situation
The only standout recruiting class he brought in - and that's relative- is the one that hasn't arrived yet.
What evidence is there that this roster is better, I won't even ask much better, than when he started?