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Maybe the parts just simply, don't fit?
A few key points.
Chris Bosh is a great basketball player.
Chris Bosh is, from all evidence, a great teammate.
There's a lot more to like about Chris Bosh's game than to not like.
That doesn't mean he's the best big forward to place on a team with Dwyane Wade and LeBron James though.
There are times when he certainly is a huge force to be reckoned with. The problem is, and always will be, that he's not a back-to-the-basket, low post, force to be reckoned with. Great big men are great because they rebound, block shots, and score from the low-post.
Chris Bosh doesn't really excel at any of those things. He's a big person, but he's not a classic NBA "big man."
That's okay, he can be, and still is a very good, productive player. Yet when the games become as competitive and intense as the NBA Finals are, his skill set doesn't represent enough of a departure from the defensive posture a Heat opponent is already in to force them to change their defense.
That's a problem. Ideally if you're going to build a "Big Three" the players should complement each other more than overlap each other.
In Boston Ray Allen was a shooter, Paul Pierce was a slasher, and Kevin Garnett was an under-the-rim guy who patrolled the paint.
The Oklahoma City Thunder team the Heat are matched up against have James Harden coming off the bench. He will at times replace either Durant or Westbrook on the floor. This not only allows one of those key players to rest, the team still scores in bunches while one star is not on the court.
Bosh isn't that guy though. He's been a starter, and an All-Star starter for nearly his entire nine-year career. He's only 28 years old; it's a bit soon to try and change him into a sixth man.
Trading Bosh could bring another player, with a ton of talent, who can play a different role while on the court. He could be more defensively focused, he could score from in the paint more, and he could be a fierce offensive rebounder. Sometimes it's not just about throwing three players together who are all best of friends off the court.
It's about how they play on the court, together, when the games are at their most important. The Heat are about to find out if this current mix works.
If it doesn't then they'll need to address a few of these seven trouble spots.