naruto was a baby when minato give him the ninetail and also sasuke is genetically born with the uchiha blood line to unlock the sharingan and the chakra of the elder sonOh dear, I don't want to say much but what i will say is IMO taking away the kyuubi from naruto is like taking away the sharingan from sasuke (they were both practically born with it xd). Also from the fights sasuke and naruto have had it seems to me that naruto has been holding back where as sasuke has actually tried to kill him, so if naruto were to actually go all out IMO sasuke would be screwed.