I'm no expert, but it seems to me that the only real noisy part of Lewis's swing is the leg kick. Looking at the video in this article frame by frame, his hands don't seem to move all that much during his load. He brings the bat down and then forward before whipping his hands through the zone. I guess they could cut the downward wag out, but it doesn't seem all that disruptive to me. His head stays level for the most part, although it sinks as he comes out of his leg kick. I can see how this might disrupt his eye level and cause him to be slow on fastballs and fail to recognize breaking balls. That said, he seems to get to a balanced position as he makes contact with the ball (maybe he's a bit out front in this specific clip, but I was able to draw a vertical line from his ear hole to his back knee). Again, I'm no expert, but I think shortening his stride just a little bit may do wonders for any pitch recognition issues he might have. Sounds like game planning could also be a major component of his improvement.