I think Ellis has the higher ceiling and he'll eventually be "ahead" on the depth chart. That said, I'd think it was all semantics. You have one nose in the 3-4, so someone has to be the "one", but that doesn't make much difference if Rex is dialing up those weird formations. Hell, you could argue that against Atlanta Wilkerson was our #1 NT.
I like Snacks, and I think he's definitely going to play a role on this team, but Ellis is going to be sick with Mo and Richardson. Actually, thinking about it, isn't the only guy who's technically a lineman who won't line up at tackle, Coples?