Bosh made the playoffs with a 41 win and 47 win team in the east and got eliminated both times in the first round, he's a stats stuffer. W
ade was elite until 20011 but him and Bron have overlapping skil sets so there union didn't maximize both of there strengths 100%.
Kobe on the other hand played with a top 7 ALLTIME player in his prime who was a perfect compliment to his skill set, not to mention arguably the best coach of all time. As soon as those guys leave Kobe can't even qualify for the playoff's in some years and when he does he's one and done. Then Phil comes back and they get Pau and Kobe gets two more rings while shooting weak percentages, including 6-24 in a game 7.
Lebron's pretty much surpassed Kobe in individual achievements and is still 30 so he has time to get a few more rings to even up the team accomplishments.
And lets remember 1-2 rings as the man >
then 3 as a side kick 
, so Lebron's got that in his favor.