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Should play: Power forward
The things that this guy has been able to accomplish while playing out of position is impressive. Al Horford is listed at 6'10", and that's at the very maximum. His length does not stand out. Only his hard work does. He hustles, he trains hard, he fixes his weaknesses.
So let's look at him as a center, which is what he mostly plays. Horford has the strength to at least compete and the athleticism to stand out. He's a good enough rebounder and defensive player to contend. And while he can back down or face up just as well, he generally faces up to utilize his quickness. But he doesn't really have superstar potential.
Now imagine that's he's always played power forward, so think hypothetically with me. Horford is one of the strongest forwards in the league, with adequate height and length, but he also has the agility to match up with any perimeter-oriented big man.
He can easily back down most power forwards, and if you put a bigger center on him, he will be able to face up and either get a good look with a jumper or drive for a high-percentage look at the rim.
Horford also is an absolute-rebounding force for a power forward, and defensively he can take some of the pressure off the center.
Basically, he excels in all areas. If you choose to go small at times, he will still give you impressive play at the center spot.
Take your pick.
The day the Hawks get a real center and let Horford play power forward and Josh Smith small forward, they will have one of the most unstoppable forward tandems of our time.