Lebron has done a lot on his own. True. He also has played in the east. You aren't talking about anyone who has been any good over there to challenge him.
On the flip side, look at who the other guys were playing on their way to the finals. That 63 point game Jordan had in the playoffs was against a celtics team who had DJ, Ainge, Bird, McHale, and Parish as its starting 5.
The other guys I mentioned were incredible. Kareem, imo, is the most forgotten and underrated player on the list. I have zero doubt that if you put any of those guys on those Lebron teams, that they could have done the same thing. In the case of Bird, we know that to be true.