Sorry in advance for the long post.
I've stated it numerous times that I like Lebron James as a player, and I would like to see him succeed. I've never said he is the greatest player in NBA history, though, but I think he gets more crap than any other player, some of his own doing to be honest. But, I'll throw in one last argument to "defend" Lebron.
The list of NBA champions since 2000 are as follows (in all honestly, I chose 2000 arbitrarily as a cut off point for the "modern" NBA era...if I'm wrong or missed anything, by all means correct me):
2000, 2001, 2002, Los Angeles Lakers (Coach Phil Jackson)
2003 San Antonio Spurs (Coach Greg Popovich)
2004 Detroit Pistons (Coach Larry Brown)
2005 SA Spurs (Popovich)
2006 Miami Heat (Coach Pat Riley)
2007 SA Spurs (Popovich)
2008 Boston Celtics (Coach Doc Rivers)
2009, 2010 LA Lakers (Phil Jackson)
2011 Dallas Mavericks (Coach Rick Carlisle)
2012 Miami Heat (Coach Erik Spoelstra)
2013 Miami Heat (Spoelstra)
2014 SA Spurs (Popovich)
2015 GS Warriors (Coach Steve Kerr)
So in the last 15 years, only 7 NBA franchises have won championships (Lakers, Spurs, Pistons, Heat, Celtics, Mavs, and Warriors). Of those seven franchises, four have HOF or soon to be HOF coaches: Phil Jackson with Lakers, Popovich with the Spurs, Larry Brown with the Pistons, and Pat Riley with the 2006 Heat - with the caveat that he took over for Stan Van Gundy late in the season due to health reason *ahem* (Gregg Popovich is the only one of those four who is not currently in the Naismith Basketball Hall of Fame, but with five championships, I daresay he's a pretty good bet to make it in eventually.)
Then you have one very good coach (Rick Carlisle) who, while may not make the HOF, is generally considered among NBA players AND coaches as a top coach.
The other two are Erik Spoelstra and Steve Kerr, who are good coaches in their own right, but it could also be argued that they won championships based on the talent of their respective teams.
So when does coaching enter in the equation? Now, just to be explicit, and to stave off any possible misunderstanding, BY NO MEANS am I arguing that Lebron's Finals records is a product of strictly coaching. But it is a point to consider. The 2004 Pistons defeated a superior Lakers team, and you could arguably state that the 2011 Mavs beat a superior Heat team as well. Lebron James' coaches in the NBA thus far: Paul Silas, Brendan Malone, Mike Brown, Erik Spoelstra, David Blatt, and Tyron Lue. He's faced Popovich three times (1-2), Carlisle (0-1), Scotty Brooks (1-0), and Steve Kerr (0-1, looking at 0-2).
Just a point to consider.
EDIT: Somehow I forgot about Doc Rivers when I was typing (happens when you type too much). I would rank him slightly behind Carlisle, but above Spoelstra and Kerr.