Cant forget Nolan Ryan, as well as the young stud Dice-K. More than anything though intiating by bringing your arms over your head is simply timing. There is no real leverage from it. A lot of coaches feel it is simply wasted movement. Another thing is if you mess up on timing while doing this it can cause everything to fall apart. The Mets might have noticed a trend of rushing? Who knows, I don't see a problem with it, as long as the motion can be repeated, which I'm sure a 1st rounder is is more than athletic enough to do so. The coaches might have just wanted to eliminate wasted motion to make things simple, and to make the difference between the full from the stretch less dramatic.