I don't know about that, David79. In one of the games toward the end of the season (Purdue?) they brought in the 2nd team OLine for several series. IIRC it was Donnal at LT, Ward at RT, and Simmons and Gaul along with someone else ... and I can't guarantee who that was but they may have left Walsh in at RG ( or possibly they left in Blythe at Center). I think that was a pre-curser to what we might see in 2014, if Scherff jumped. Scherff coming back allows Donnal to move to LG and I really think that they will keep Ward over there at RT to give him time to develop alongside of Walsh.
That would give them a pretty powerful left side of the OLine in 2014 and pretty salty Right side in 2015.
Just my 2 cents. I'm sure the Ferentzes will try lots of different combos, including Donnal at RT. If I am a gambling man, though, I would bet it would be from Left to Right: Scherff, Donnal, Blythe, Walsh, Ward.