Just think of the numbers he would have put up with a QB that could throw a pass instead of lame ducks...
If your offense starts with the desire to have the QB run the ball often, whether between the tackles with power like a classic Wisconsin RB, or around the end and in the open field with speed and quickness like a Pat White, you will get many lame duck passes, as well as passes that simply lack accuracy and/or touch, as well as less than 1st rate ability to read pass coverage.
Nathan Elliott ran the ball often in HS. His passing game was predicated upon Ds stacking the box to stop the run, often leaving receivers so wide open they likely got lonely. Elliott is exactly the kind of QB a Fedora would pursue, not thinking he would be a great starter but a great practice player and backup.
The faults with the Fedora offense are not in signing QBs who are not all excellent athletes but that when you lack a QB who is a major threat to run, the offense often is exposed as hollow, at best ringing up many yards while failing to dominate games, forcing foes to alter what they want to do.
Mike Leach's spread, conversely, almost always forces DCs to rethink and refocus, to try new things, to get out of their comfort zone. It is much easier to prepare to face a Fedora offense than a Leach offense.