Yakn was a great stunt man and double. In GONE WITH THE WIND he was used as a double for Clark Gable, and in one scene where he drives a wagon up to Scarlet, he looked so much like Clark they left the scene in the movie instead of re-shooting with Gable.
He was later the white renegade (along with a black former slave) who attack Scarlet out on Decatur Road.
I can see how he'd really double for Clark Gable, even in size.