Physically they are rarely ready to grind for 12 games. How many times did Walker start? I know of other times under Stoops true FR start towards the end of seasons due to poor depth or injuries (example is Darrian Kinnard at RT).
Also, Paschal started off as OLB before putting on weight and moving inside. That was also 2017 before there was as much depth as the 2024 front 7 features.