If Buechele had the pass protection and rushing attack gainst Marylland that Ehlinger enjoyed Saturday, we'd be 2-0 and sportswriters wouldn't have to contrive a QB controversy.
Ehlinger didn't turn the ball over, and was certainly adquate against a weak opponent. But, keep in mind that Lorenzo Joe's spectacular salvage of another off-target throw increased Ehlingers passing yardage 25%, and prevented his completion rate from being below .500. We've got to have more accuracy to be competitive against top defenses.
Right now, Ehlinger's best asset is his sturdiness. He has a LB's body and fans don't cringe when they see him scrambling. But, given proper pass protection and a good running game, Buechele is the best option, hands-down.