Lacy is a step better than Bam was, even if Bam wasn't high. Lacy has a much better ability for YACs then did Bam. Look at how many YACs Lacy has, and those have little or nothing to do with his OL. He has a nice combination of quickness, fluidity and power. Bam was more of a straight ahead pounder with little moves. Lacy had a good deal of moves and spins (not overboard spins like Mendenspin).
Lacy won't be playing the ND's of the world when he 's in the NFL, besides he had a dominate O-line in college two first rounders on Bama's line so that helped him.