Probably not a big enough sample to be able to draw a reasonable conclusion.
BTW, here were the final numbers from 2003 (courtesy Behind the Football Stripes):
Crew Chief......G..Tot..Yards..PPG
Walt Anderson..15..257..2,193..17.1
Johnny Grier...15..238..2,001..15.9
Ron Winter.....15..213..1,666..14.2
Tom White......15..211..1,817..14.1
Terry McAulay..16..224..1,864..14.0
Jeff Triplette.15..210..1,813..14.0
Pete Morelli...16..217..1,972..13.6
Larry Nemmers..15..197..1,550..13.1
Ron Blum.......15..194..1,592..12.9
Tony Corrente..15..193..1,617..12.9
Ed Hochuli.....15..190..1,610..12.7
Bill Carollo...15..188..1,944..12.5
Walt Coleman...15..179..1,472..11.9
Mike Carey.....15..173..1,457..11.5
Bill Leavy.....15..172..1,400..11.5
Bernie Kukar...15..167..1,315..11.1
Gerry Austin...15..166..1,394..11.1