There is a big difference in repairing a partial tear and a full tear. There are different levels of partial tears. It could be a little rip, a big rip a medium rip. Its why they break them down like that. The news oversimplifies things and does not get into that they just say ACL tear because they know most people won't get it or care. Thats one reason why some guys come back way faster than others. Have you ever noticed when its one of those ACL tears you can diagnose during the play as a guy on your couch those guys rarely come back fast? Because those are big obvious serious tears..
Think of it like this whats harder to fix a rip in your jean or coming back from full-on Jhorts? WIth the rip you can maybe patch it and people would only notice at certain angles. Once you go Jhorts you're never the same.