So if Barnhill (in the video that opens this thread) had managed to drag her toe tip and still replanted and pushed a few feet in front of the pitchers plate, that would be OK?
If yes, why wouldn't you teach all pitchers to do that?
Put another way, if Jake had a little sister, would you teach her Barnhill's technique?
Jake has nieces/my granddaughters and not no, but hell no. Bottom line is that Barnhill is successful in spite of being illegal, and her very poor mechanics.
I often hear that we should just let them pitch like the men. I have had numerous pitchers including Jake play the "what if" game and throw outside the rules for grins. All I can say is that if you have a DD that hits, be very careful what you wish for!