It has been his second most effective weapon after his straight left and it was MIA last night. It zaps the energy out of opponents and with Diazs soft stomach he wouldn't have been able to breathe if he caught him with a few. Everyone knows Diaz has an iron chin so if he would have thrown the spin kicks to the gut, especially with Diaz on a short camp, Diaz would have been gassed like Mendes and then those straight lefts would have actually done damage. Standing and only trying to box was just horrible game planning by SBG.