FULL recovery from an ACL tear takes about 2 years. He is already ahead of schedule He, himself, has said he's about 95% back.
Plus, remember in essense this kid is a rookie. Almost every RB - even one coming from college fully healthy - has his best years in years 3,4,5 etc.
For a rookie, coming off such a major injury, I'd say he's doin' ok.
At least...a little bit...