First of all James is a much better shooter than Wade from anywhere, and a better three point shooter than Kobe or Jordan. But the more important flaw in your analysis is that you are comparing teams that won before the spacing era that started this decade to the older eras where the value of the three pointer was not acknowledged. Just look at all the championships since the Mavs won in 2011...all the winners were amongst the best three point shooting teams in the league, both in terms of frequency and in terms of accuracy.
Two of the examples you cited are during the days of illegal defense rule where guys didn't even have to shoot well to have a degree of gravity. By virtue of standing on the three point line, someone would have to guard non-shooters until Michael or Bird caught the ball, giving them more initial space than any star would have today if he wasn't surrounded by shooters. If you put non-shooters around any modern star, the paint would be clogged and the defense could shade towards them before the catch.
If you put LeBron on any of the rosters of the teams you mentioned above in place of the respective stars of those teams, the teams probably still would have won it all in those years. Are you really trying to argue that LeBron couldn't beat the Magic or the Celtics in 2009/2010 with the likes of Gasol, Odom, Bynum, etc. instead of Mo Williams and the corpse of Big Z? But none of those rosters you mention above are ideally suited to face teams like the 2014 Spurs or especially the current Warriors squad who are perfectly content to trade twos for threes. So the reality is that modern basketball requires a team of floor spacers around LeBron...and also around every other great star who wants to win a championship. That's not some flaw inherent to LeBron...that's just the reality of the NBA.
