Do we? Were Bower and Jewell next in line when they were RS Fr? How about ISM? Certainly Fant is older than Pekar. Wirfs is obviously the elder tackle on the roster. And thank goodness we don't have Stanley starting over Weigers.
That's just recents. I can go all the way back to Greenway supplanting Worthy to show other examples.
Kirk has, and always has, played who he and his crew felt was the best player. Maybe you've never played football or any other team sport, but a HUGE part of being the best player at any position in any sport is understanding what it is you are supposed to be doing out there. Generally, guys that have been in the program longer have an advantage there. But there's been countless examples where younger guys learned their assignments well enough to take over the role early.