I have a hunch your grandson is, at best, third on the depth chart because it is highly unlikely that second teamers didn't make it into either of the first two games.
Look at the bright side; if he doesn't get put into more than four games this year his red shirt year is preserved and maybe if he gains some weight and strength he will be able to play for a different head coach.
BTW, what is the name of the OL who you believe is doing an impersonation of a sieve?