why miami heat keeps losing on end-game situations

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when the chicago bulls reigned in the 1990's,they got the luxury of having michael jordan bailing them out during end-game situations where the bulls need to score the final basket to win the game.kobe bryant does the same heroics for the los angeles lakers.my point here is not to compare jordan from kobe.what i am trying to point out is the fact that miami needs that one guy to bail them out during near-losing situations.surely lebron is there.wade is there.but who should handle the ball?who has the better shooting percentage?wade or lebron?