Do you really believe an elite athlete who has had a surgeon "fail" him twice is ever going to allow the guy to cut on him again?
If a mechanic cheats you twice on transmission repair do you go back to him for a brake job?
Broken bones are a helluva lot easier to deal with than torn ligaments.
One thing is certain. The first two reconstructions were performed by the team doctor and the third was performed by the #1 knee surgeon in the country. The first two failed, the third was successful. But I'm sure that's just coincidence.
He stayed in the game because they were trying to get to be ranked in the top 4. Margin of victory matters in college football. It’s dumb to leave your starters in during a blowout in the NFL, but college teams will do it to increase their rankings.