Like CD says, he's tall and skinny. Every video I see where he "wins the rep," half the time the defender isn't even trying... the other half he's pushed into the QBs lap right at the release.
He looks to me like a guy that will be a top-shelf LT in his third or fourth season, but we don't really have that luxury.
Ekwonu on the other hand has the size, the strength, the "want it," and the athleticism, but needs a little technique work. Normally that might scare me, but the dude had two Ivy League offers; he's a smart motherfucker, he'll get the technique.