Are you referring to his chakra capasity? You do know he was nominated Hokage already, correct?
I dont see how he would have embarrased the other Hokage. Right now they are embarrasing themselves! They are ALL getting owned by Madara. They used up almost all their chakra to do an excellent combo attack and it still was to no avail. And now they are also chakra-less and some are about to die. Kakashi may have been able to turn over the fight, he actually has a sharigan himself. Maybe you underestimate him alittle...? He is currently fighting a few tailed beasts & Tobi, IDK if you remember that.
-gHost Senju, K.U.S.H. Sage