Correct me if I'm wrong, but wasn't the Chris S. sighting on JULY 15th? I know KC dismissed it and said it wasn't her (not that anything she says should be taken as fact). Anyway this was the day it hit the fan at the A's house.
I don't remember any specific area on Chickasaw where he stated he possibly saw her, but it would be highly unlikely she would be on Chickasaw if she was staying at Lazzaros place. It is almost 3 miles from his apt. to Chickasaw and Colonial.
Anyway, Chris S. lives a mile or so from Chickasaw between Lake Underhill Rd. and Curry Ford Rd. Don't really see her being down that far if she was on foot.
As far as the ping, several towers, including the one at Chickasaw and Lake Underhill have pinged as well as the 2 towers on S. Goldenrod Rd. These will all ping if you travel either Chickasaw Tr. or Goldenrod Rd, depending on the cell traffic at any given time.