It came to me as an epiphany. The reason T.O. is such a selfish, pain in the ass player is because he is truly a basketball player who happens to be playing the ultimate team sport (football). Let me explain you my hypothesis.
According to T.O., his first love is basketball; football he just plays. On the basketball field, one super star can win the game single handedly e.g Jordan, Lebron, Kobe to name few of the greatest one man show on this planet. T.O. is a super star on football field and he thinks he can win it all by himself. Therefore, all this cry about "give me ball, give me ball".
Till T.O. is with cowboys, they are not winning anything. He is Kobe on football field, and there is no Shaq to tell him "hey Kobe, How my ass tastes?"