Because he broke away from the first Arkansas player, I think it's a good call. If those other Arkansas players aren't there to make the play in the endzone - the tOSU player breaks the tackle and gets free.
Technically, maybe, but have you ever seen a RB on the goal line not get the benefit of the doubt like that? He was all the way out to the 2, and it's not like he ever really broke free, he just kept his legs moving the whole time. Never seen a call like that one before.