I'll say this about Lebron, when he is on top of the world, he will let it be known. Lately he is as boisterous as ever, plus he knows that three peating, and 4 straight Finals would elevate him into near tier 1 status.
But I still am of mind that when everything around him is shaky, he crumbles under pressure. That is personal opinion, but I can assume it even watching the last 2 post season runs, let alone his Cleveland years. Give him a decent lead or a hot hand, and he is adamant. Some adversity or bad moments, and the immense change in body language is too obvious, from the widely observed passing up the big shots, to settling for jumpers, last postseason he had some terrible free throw attempts, late TO's that defy his typical ball handling. Again the guy is a statistical juggernaut, and still building hardware and to a degree I can say he is clutch, any great player should have clutch moments which he is and does, not denying that. Some players want that last shot because they love that moment and opportunity, in a perfect world if Lebron didn't have to take them due to his 'image' he pass it more times than not.