You are getting hung up on qualifiers and ignoring history - LeVoir is at least as good as Gorin if not better, if he's NE's RT they can get to the playoffs again. From there the skies the limit. In my book a major downgrade would be asking Koppen to play RT in place of Vollmer, I'd have doubts about getting to the playoffs in that case.
Orhnberger was waived and signed to the PSquad, then re-signed to the roster. I did not say he was ahead of Wendell, I looked at the worst case scenario if NE has to put together an O-line to play tomorrow without a draft, Light, or Mankins. Starting Big O at RG is an attempt to create stability on the line. O reminds me of Andruzzi a bit, limited athletically but giving you his all. In preseason he played his best at RG, I don't want him at C - no way, no how. Connolly at LG is another stability decision and an improvement on O at LG. The most stable O-line looks like Kac - Con - Kop - O - Vol using just the players on the roster and presuming NE's left side is gone.
Wendell, after Connolly, is the most versatile of the interior reserves based on 2009 and 2010 preseasons (my lying eyes again). I don't want to be in a position mid-season to slide Wendell over from RG to cover for an injured Koppen or Connolly. You'll pardon my eccentricity in this case because the image that comes back to me is watching the streak-busting Pittsburgh game in 2004 with Gorin flipped to LT and Hochstein playing RT. Scar tries to prevent major reshuffles on the line with good reason.
If O's plugged in from day one he gets a chance to grow into the job while Koppen and Vollmer help him. Wendell is available to pull him for some coaching up by Scar. Different players are more adaptable, wearing my personnel manager's hat here I see O as a kid who needs continuity to play his best, Wendy is less restricted about moving around.