Where we differ is the ability of a 350-375 pound RG to be able to start at LT in his rookie year in the NFL. I believe that Thuney was a LT in college, a very natural source of NFL LG's. And no, I don't think that even Mason would be as good at LG.
So, the bottom line is that ability to shift positions. Should we consider Onwenu as our center if Andrews isn't up to playing? How about LT? For me, an NFL rookie isn't necessary NFL quality at many positions, usually just one, although flexibility is a good thing.
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Where we differ is that I see a 350 pound RG as having flexibility to play RT, while you see that flexibilty at LG and perhaps other positions.
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As an aside, I would be SHOCKED if Onwenu beat out Froholdt at LT if Thuney is traded. I would be less shocked if he played some DT.