I think this young man looks pretty good. The "after" clip shows a significant change in arm action. It went from very Billy Wagner to a more W motion. I wouldn't say he's classic M but there is some of that there. He's really trying to scap load here and the focus on that is resulting in the forearms pointing somewhat downward but not as much as Prior or Smoltz.
I'm not as concerned about this as I am about his timing. It's hard to tell from the after clip because of some "junk" on the clip over the upper body. I think his shoulders are significantly open at footplant but I can't really be sure. Do you have a better video?
He has much more explosiveness to his arm action in the after clip. I like it. Good job, baseballbum.
Also, what does it take to post video directly like this?