I don't want to start a kick CPF thing but while your stats may be correct, your point isn't.
Jamal didn't start until we had pissed away the UF game. Presumably because he didn't know the blocking schemes/blitz pick ups. Assuming that is true My guess is the senior QB that year may have insisted he not start until he had that taken care of.
Peyton didn't start until a few games into the season, injuries to 2 different QB's and if I'm not mistaken Brandon Stewart got a start before Peyton did.
Clausen was pressed into duty because AJ Suggs and Joey Matthews were a little overrated coming out of high school or underdeveloped once they got to campus. Thing is Casey wasn't supposed to play his freshman year but lack of production by the two guys ahead of him forced CPF"s hand.
Ainge and Schaefer split time most of that season with Rick C coming later in the season to replace EA after an injury.
CPF played upperclassmen even with more talented younger players on the bench. To be honest i don't fault coaches who do this as many times (see the current Mr Banks for a recent example) the younger guys simply haven't earned a coaches trust and probably don't have the nuances of the offense or defense down. While the youngun's may make big things happen they often cause big things you don't want happening to happen also.