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Neither player is selfish enough to play together
You're probably thinking something along the lines of: "You can't be serious? Of course LeBron James and Rajon Rondo could play well together. LeBron's a scorer and Rondo is one of the best passers in the league."
That's true and all, but you're forgetting that James is also one of the best passers in the league.
Rondo has averaged 8.1 assists per game in his career vs. LeBron's 6.9 career assists average.
It's clear that LeBron is currently playing with other superstars like Dwayne Wade and Chris Bosh, so high assists numbers make sense.
If he has great players to pass to, then you would expect his assists numbers to be high.
But what about when his supporting cast wasn't as good?
James' first seven seasons were spent with the Cleveland Cavaliers where he was the clear superstar. Sure, he could pass to Mo Williams and Antawn Jamison for that assist, but his best option would have probably been to just pass to himself.
The interesting part is that he put up his four highest assist totals of his career during his time with the Cavaliers. Averaging at least 7.2 assists per game with the team he had is straight up impressive. Not to mention, his last season in Cleveland was spent averaging 8.6 assists per game.
The man can pass the rock.
Not only can he pass it well, but it also seems as though James is a pass-first player.
He'll absolutely get his points, nobody is disputing that. Questions just need to be asked about whether he could play with someone like Rondo.
Watch one Miami Heat game and you will see the majority of LeBron's assists coming from drive-and-kicks or drive-and-dumps.
Both those terms have to do with how defenses collapse when James drives to the basket. The defense forces him to either pass the ball out to an open shooter on the perimeter, or to drop a pass off to a big man or somebody cutting to the rim.
Rondo doesn't fit either of James' targets.
Being scared to shoot from outside of 15 feet, means that LeBron won't be able to kick the ball out to him. You also won't see Rondo cutting to the basket because he has to worry about getting back and playing transition defense.
Could Rondo maintain his style of play next to James? He probably could. LeBron would be a much more active and dominant Paul Pierce in Rondo's system, so that's not too hard to see.
The issue is that James would not be able to play his kind of basketball, and no superstar wants to change how they play.
Especially when they are as effective as he already is.