I'm sorry guys but look at the history of the league.
There is no correlation between athleticism and fouling.
You guys can keep saying it, and it makes sense, but there's just no evidence.
That's like saying there is no correlation between athleticism and scoring. Yes, lots of hyper-athletes never figure out how to score, but there are tons of athletes who figure out how to use their athleticism to help them score at the NBA level.
Players who use their athleticism to stay in front of their opponent need to foul less often, because they're caught out of position less often.
Older players have learned how to play better defense at their athleticism waned, or just flat out play worse defense.
There are unbelievably athletic/great defenders who aren't "too physically gifted" to avoid fouls (Josh Smith for one) and there are unbelievably slow/great defenders like Jason Kidd that don't foul (1.5 since he turned 36).
Josh Smith is currently drawing 2.7 fouls per 36 minutes at age 27 as the main help defender on his team. For context, Kobe Bryant in 2008, the year he won MVP at age 29, fouled 2.6 times per 36 minutes. Josh Smith absolutely uses his athleticism to make plays that are non-calls when lots of other guys would be forced to foul, or just choose to not make the play at all.
And Jason Kidd was freaky athletic as a young player, and absolutely used his freaky athletic skill set and size to help him play defense without needing to foul.
Now, he mainly guards 2 guards, or gets blown-by like an afterthought.
That's makes my point, nobody makes correlations between athleticism and scoring like that. You don't say this guy's really athletic, he can score a lot of points, just like you shouldn't say this guy's really athletic, he can avoid a lot of fouls.
It doesn't bother me if people say it helps, but there are tons of great scorers and defenders that are unspectacular athletes and a lot of the great athletes are incapable of establishing that better positioning so it's a weird argument.
Elite defense is much more of a style than a quantitative analysis. The idea is to get away with as much as possible without getting called for it. If LeBron doesn't do this than neither does Ron Artest, Kevin Garnett, Bruce Bowen, Kobe Bryant, Michael Jordan or any other all-defense 1st team member. These guys are smart enough to know what the refs are going to call based on when it is during the game, the angle at which they can be seen, how the game's been called up to that point, how much attention is being paid by the refs to that part of the floor during that particular play, etc.
If LeBron didn't commit as much aggressive physical pressure as he does, he wouldn't be as respected of a defender as he is. Thanks to instant replays we can see things the refs don't, and we see they give him a little too much respect sometimes (calls based on reputation). Not everybody makes claims like this due to silly 6 game streaks, some of us actually watch him play.