thats not uncommon, the ACL is one of the two major structural ligaments that hold the knee together but allowing most movement in the forward/backward plane, and a little in the lateral plane, there are other ligament structures around the outside of the knee, surrounding the knee capsule. It's likely that if the inner major structure is compromised, the outer ones will also suffer damage, there will also likely be cartilage damage too although looking at the way he walked off relatively pain free, I'd say if there is any cartilage damage, it will nee easy to tidy up. I'd say this is media story mongering and upping the ante. There may well be extra damage but there normally is.