He showed some promise as a good run blocker, and he didn't appear to have any problems in pass protection. But appearances can be deceiving. During the preseason, he'd only play late in the game when the coaches were calling a lot of running plays. So his pass blocking should be graded as incomplete. If he can't pass block, then the Packers shouldn't have kept him around. His run blocking can't be considered great either since he was usually lining up against other players who didn't make it on the final roster.
The fact was he was never given a shot at beating out either T Allen Barbre or T Breno Giacomini was a good indication that he's not ready to play. If he really might have become a starting right tackle one day, we would have read something during training camp that he was pushing Barbre or Giacomini for the wide open starting right tackle job.
The Packers are expected to sign T Dane Randolph, another athletically talented underachiever, to take his place on the practice squad.