The time before the final scene when he walking/coming down the stairs is SOOO not Steven, no way....And this guy damon is ugly, nothing like Steven, yuck...You would have to make him wear a mask to make me fall for that, and I couldn't even then, because I know Steven's body pretty well, too...The doubles in BOTB and HPD were very close to him, except the hair gave it away sometimes in BOTB...And in OOR, I only really noticed it the one time on the stairs as the guy was so puny looking, if I notice any others I will let you know...
I suspected the sommersault was not him just because he probably would want someone else to do that, but really I honestly couldn't tell...