[Uncle Slayton]

Zimmmer’s father says it was George screaming and his opinion should be the only one to be considered fact.

[Cboldt]

Some eyewitness(es) may have been close enough to discern which of the two was screaming what.

If one is able to testify "the guy on the bottom who was getting his head bashed on the ground" is the one screaming, that's compelling.

[Tunehead54]

"Zimmmer’s father says it was George screaming and his opinion should be the only one to be considered fact."

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One other fact I'd add is that Trayvon's dad said that wasn't his son's voice on the 911 calls ... just trying to help. ;-)