You are arguing the wrong point. Of course I agree with you that sleep deprivation negatively affect performance of all players (indeed all human beings, and probably most living beings). That is NOT the issue.
I simply suggested that linemen, having a more physical task (NOT exclusively physical, just more than other tasks) are affected less than other players, whose performance is determined by very tiny adjustments involving eye, finger, hand and legs coordination. Then again, until a rigorous scientific study on this is done no one can prove or disprove the other.
As I pointed out to you, going-to-bed times are extremely easy to control, but falling-sleep-times are a different story. In order to emulate the 4:40a gameday wake-up time while still sleeping the recommended 8-9 hours, Stanford players would have had to be sound asleep about 8PM daily...yes they may all have been IN BED at that time, but falling asleep is a different story. Many may have just started sleeping at their normal time (perhaps near mid night), and still make the early practice under reduced sleep time, making up somewhat through a midday nap....Probably something similar happened on Friday night, leading to many of them playing after only 5 or fewer hours of sleep.....see your own comments on the effects of sleep deprivation.