The only reason we find "starters" in the later rounds is because our players really aren't that good. Truth is, these "starters" usually wouldn't be starting on most other teams. These "great finds" become starters more out of necessity. Someone has to start and they can't all be free agents.
That said, the other strange thing is that usually NFL teams usually have a greater likelihood of finding quality players in the earlier rounds. As the rounds increase, this probability usually diminishes. Not so with the Bills. If the probability of finding a starter, regardless of the round, remains equal, then it appears these selections are just random guesses, rather than educated/researched guesses.
Bulls eye.