You've lost the plot. You can name all "similar" height DTs you want (don't worry, there aren't many), but the point is, Green's size (height AND weight) make him injury prone which was my original point. His track record has proven that. I'll be happy to be proven wrong on that this year.
It's great that Jemea and Godhigh performed well at their size...but they're not slamming against 300+ lb'ers every snap like a DT has to. There were some plays where Jemea and Godhigh didn't make physical contact with anyone at all. Different physical stress for their positions so the comparison doesn't hold.
There are actually plenty of examples. Just named several off the top of my head.
One player's injury history doesn't prove anything. Sample case of one is just that, one case. Doesn't prove anything.
Last time I checked Gotsis and Attaochu played the whole year at similar weight-difference match-ups. So did many others in previous years or for other teams.
Last year's all-ACC defense:
DE - Vic Beasley, Clemson, 6-3, 225, Jr-R.., Adairsville, Ga. (161)
DE - Kareem Martin, North Carolina, 6-6, 265, Sr., Roanoke Rapids, N.C. (159)
DT - Aaron Donald, Pitt, 6-0, 275, Sr., Pittsburgh, Pa. (171)
DT – Nikita Whitlock, Wake Forest, 5-11, 250, Sr.-R, Wylie, Texas (156)