However, once you suffer one, you're more likely to re tear it. He probably won't, but there's a higher chance he will than the average player.
Thats bollocks.
Plenty of players who have done their cruciate and gone on to have perfectly decent careers. If they didn't there would be a mass of retired players..
Sadly it's not bollocks. I've done mine twice and the surgeon who performed the second op confirmed a new ACL has an average lifespan of 10 years.