what I mean is lebron has never lacked confidence in himself... but having confidence in one's self to perform is very different from being confident of winning... that is why he seeked help in miami, in the end this is still team game and no amount of utter confidence can make you win if your team is inferior to the Lakers, Celts, Spurs or even the Bulls both physically and mentally... With an ego as large as his I don't think he ever loses confidence in himself...
Remember...in the Bulls 6 title run there were games in the play offs were Jordan and Pippen were off, and it seems that there is no way they can win but it was always the bench that made a run for them before the dynamic duo finishes them.
Lebron just changes the flow of the team that he is in and if you cant keep up you will end up struggling... this is what is happening to his team mates right now... and these are not so so players... Bibby is a definite upgrade from arroyo, Mike Miller is a versitle shooter and james jones is the 3 point champion yet he cant even shoot any shot.... Lebron may have 8-10 assist in a game but most of these are to wade and sometimes bosh... he never sets up his other team mates.