you don't think it's important that Ms.Fulton heard the screams of her son dying??????
I do not believe it's important that she believes it was her son, no, not as "evidence." I've mentioned this a number of other places but she did not go in to hear the recording thinking her son was alive. She knew that her son was dead and subconsciously one fact probably "linked" with another. The same thing would probably happen if you took the same exact tape to my mother, told her I was shot to death and played the tape. I'm not saying she's lying, I do believe that she feels that it was her son screaming, but just because she believes it doesn't make it true.
Also, Mrs. Zimmerman has stated that the voice is George Zimmerman's, so they cancel each other out anyway. I feel the same way about her statement - for "evidence" it's not really that great.