I don't think an 11 year old kid scared out of his mind, and in the pitch dark, can give an accurate description for height. Kids also don't understand 5'10 vs 6'2. He was 11 years old and much smaller than the man. I wouldn't discount MF just because he is 3-4 inches taller than the description stated.
I guess we can agree to disagree. My son is 11. He is into sports, playing + watching....he is well aware of player's heights + sizes as are his buddies. And he is cognizant of his Dad's size versus his Uncle's size....it's readily apparent. I think the perp size is important in Jacob's case. Even today, listening to the radio....descriptions are given as to race, height, build, of criminals at large. IMO, the perp in Jacob's case fits a certain body type and that is relevant to any possible suspects.