Nice, very nice. The basic pattern is the same as canon to begin with, but already his abilities are having an effect. Between an early-on relationship wtih Tonks and the fact that he's building a mutually supportive friendship with Neville from the get-go as well as very quickly establishing a good working relationship with the Weasley twins, he's going to change a lot of things from the flow of canon, though I'd reckon that it won't be apparent for a while as it takes "ripples" a while to spread.