Yeah I agree that it made no sense to save Lynch and Lynch may have been partly responsible for his limited usage. HOWEVER, while every game does count equally on paper, let's be real; last weeks counted more. All the water was under the bridge, it was effectively the start of a new season and they had a shot to control their own destiny in the division. If ever there was a time to throw out whatever bizarre philosophy was responsible for Lynch's usage up to that point it was last Sunday in Arrowhead. And he gets seven carries and one reception.
From 10:42 left in the 2nd quarter (a 7 yard carry) he didn't touch the ball again until there was 6:11 left in the 3rd quarter (16 offensive plays without him).
His touches went for -1, 1, 27, 1, 7, 3 (negated by holding), 4, 3, 22. People sometimes forget that 100 rushing days don't often come from 20, five yard carries. To me he was running strong, that 27 yarder was vintage Lynch. They ran three more plays on that drive, all passes then punted. The game was never really in doubt from that point.
Downing is young and I stated above that coaches grow (up to a point then they become John Fox or JDR and that's all they will ever be) so it's probably early to kick Downing to the curb but...depending on his replacement I might not complain if they did.