Too bad for aapl he already bought the last bunch at higher price than current market. He also has enough cvi of his own. Havent you hear about hedging? At the end he will probably come victorious ,though in very seldom ocassions his trades have gone wrong.
as far as i know, he is majority shareholder. buying back shares only serves to slow the growth of his OWN company. a buyback is not in his interest when the majority of it is unnoticed to him. I think a lower price is needed to justify any kind of buyback.