Witness 2:
W-2 said in her first interview on March 1 that she thought she saw two people running and a fistfight. But she couldn't provide any identifying details because she only got a quick glace and she had removed her contact lenses. She said she left the room and went back to the stove where she was cooking. The next thing she heard was the the gunshot.
She was interviewed again on March 1 about distances. She clearly had no idea of distances, accepting whatever Investigator Serino suggested to her. He asked her how far apart the two guys were she saw running:
Serino: I’m going to step away from you.
About here? [He motions]
A car length? 8 to 10 feet?
About 10 would you say?
10 feet. Ok thank you so much
W-2 was interviewed again by Serino on March 9. She repeats that she only got a glance and she didn't have her contact lenses in. As to the running, she says she heard it than saw it and turned around and left the room. She returned to the back room after she heard the shot. She again couldn't identify anyone.
During this interview, W-2 either had trouble explaining to Serino where her house was -- or Serino didn't understand where her house was.
Serino: Were they running towards your house or away from your house and towards the T or towards the street?
W-2: Towards the T
Serino: So away from our house
W-2: No
Serino: You live in that row on Retreat View, right? If they kept on running, would they have passed your house?
W-2:(Pauses, then agrees.)
She can't answer how far she was from the men she thought she saw. She reminds Serino again she didn't have her contact lenses in. She says they were downstairs, she was upstairs.
The FDLE investigators interview W-2 on March 20. Same story. She doesn't know what she saw, she didn't have her contacts in or glasses on.
It's not that she changed her story. It's that Serino was so anxious to confirm a chase he disregarded that she was never sure of what she saw, she didn't have her contact lenses in, and she was clueless as to distances. She would never have made it as a witness about anything.
Witness 12:
Witness 12 appears to be the wife of W-13, who is the witness who ran outside after hearing the shot, took an i-Phone photo of Zimmerman's injuries (the one later published by ABC News on the day of Zimmerman's bail hearing), was asked by Zimmerman to call his wife, and was told by Zimmerman he had to shoot the guy.)
W-12 told investigators she looked out and saw shadows of two people, with one on top, but their porch light wasn't on and it was dark. She couldn't tell their size and she didn't know who was on top. After the shot, she saw her husband outside talking to one of them. He had a flashlight.
In March, she told police that having seen the photos of Zimmerman in the media, she thinks the bigger guy was on top and that would be Zimmerman.
I know after seeing the TV of what's happening, comparing their sizes, I think Zimmerman was definitely on top because of his size," she said.
So W-2 is an irrelevant witness who never would have been called and W-12 is minor witness with nothing to add to her husband's account, other than what she concluded after seeing images of Zimmerman on TV.
I don't think either one is a "key witness" who changed their story in way that could damage Zimmerman's defense.