Simply not the case. Grooves do not "grab the ball" and spin it. They simply don't. I wish I had a better way to say it or more credibility.
Grooves help with spin but not by grabbing the ball.
Tell that to a urethane ball after a high SS player hits it with a Pre-2010 U-groove wedge. I personally have torn up half a dozen ProVs in one round with those U-groove wedges from tight lies where there was ball first contact and no debris between the ball and club face. I mean literally rip through the cover so that I could see the second layer. With those U-groove I could spin a ball back 15-20 feet where with the new conforming grooves in the same situations I'm getting one-hoppers or balls that hit and sit.