Brutal news. Hopefully his recovery goes smoothly.
For a little bit of optimism, apparently ACL surgery has come a long way in the last few decades and a lot of players do make a full recovery.
https://allamericanorthopedic.com/ad...covery-in-nfl/
https://www.sfchronicle.com/warriors...e-13999213.php
Of all positions in all sports, I'd have to imagine an NFL running back would the hardest to recover from an injury like that. So if Adrian Peterson can rush for 2000 yards the season after tearing his ACL, IMO that bodes well.