I think Aka coming in and playing could be a good thing. That means he's as good as expected and he can have solid pt before he's asked to step in and start next season. Knott and Klein played their freshman seasons for that very reason.
I see what your saying but think of him coming and getting in the weight room for a year. He is already 6'4" 255, with a year under Yancy could come out looking about 270. Put that opposite Irving in 2013 and watch the opposing QB wet their pants looking at our D Ends!