All we'd ever need is 4 good players and we would go undefeated every year!

Name 3 games where without him we lose the game?? Out of 9 wins, you except 3 of them to be won single handedly by a LB??

I can't honestly say how much his production will be missed because I don't know enough about the backups, but your metric for whether he will be missed or not is way off