See earlier posts as to the fallacy of the Koundjio knee stories and look at more tape, because Koundjio is not incredibly slow and lumbering, that's another fallacy.
https://www.youtube.com/watch?v=D2TJ8KDsDA8
Kouandjio ran a 5.59 sec 40 compared to Su'a-Filo's 5.09. Your big boy is huge - 6'7" and 322 lbs with enormous arms but he's slow. I think that we get Martin, Su'a-Filo, Moses, James and Bitonio ahead of Kouandjio.