This thread got popcorn worthy over night. Deez, Filip, Royce, Sara and Ink covered everything. Good job gents.
Nobody said Jordan hit the game winning shot in the playoffs every single time, he wasn't perfect and he didn't do it alone - we all know that. However, there's no disputing how many clutch shots MJ did hit that vaulted him to legendary status. At this moment, I can't think of single one for Lebron - just Ray Allen hitting that killer shot - and he's played in 6 Finals already in his 12th NBA season.
This debate has never been about supporting cast it's been about individual game of MJ & LBJ.
This.
To answer your question
What player suddenly changed their style of play to win? the answer is - any great one.
You keep saying Lebron doesn't need to change his game, but you're forgetting he has already. When he came into the league the first few years, he was an absolutely atrocious post up player, completely awful with his back to the rim. His ranged game was mediocre at best as well. Through work and practice LBJ has went from awful in those situations to a threat, a pretty well rounded player which he was not initially. That is change.
Also as Sara noted, if you keep losing in the Finals why wouldn't you change your game? Clearly he isn't happy with the same result so making a change seems to be the common sense approach.
Watching LBJ kick the ball to guys like JR Smith with Finals games on the line is like watching the Seattle Seahawks run a pass play from the NE 2 yd line instead of handing the ball to Marshawn 'Beast Mode' Lynch with the Super Bowl on the line.