Lifting the back foot? Like Ruth, Mays, Aaron, Clemente, Harper, Miguel Cabrera, Frank Thomas, & Trout?!? It's always interesting reading different perspectives on hitting, that is for sure! I think Arcia's mechanics are fine. Outside looking in, his struggles might have been more about pitch selection. MLB pitchers adjusted to him and he needed time to adjust back. I'm sure he needed to make a few mechanical adjustments too. So much of hitting is feel. I would guess there might have been issues with focus at times too. A focused Arcia is a dangerous dude. In the playoffs he looks dialed in. A very very valuable player.