I believe that picture of Katie crossing the crosswalk is the last known picture of her. That's why it makes sense, that she did not walk thru the CA Gate. I believe my theory makes the most sense. She crossed at the rainbow crosswalk, walked on the north side of 10th Street. And the reason she probably did that, was to give her dog access to the bushes lining 10th Street. Give the dog some nature to enjoy. At some point, she used one of the cut thrus there, to get onto the path in the park that runs very closely parallel to 10th Street. And then walks there to the bathroom area. The other reason this makes sense is, when Katie ran, she did not run out of the park, but into the park. So that must have meant that she was on the north side of the perp.
I believe it's possible, that she on purpose did not go through the Charles Allen gate, because she did not want to be caught on camera. Which might shed light on what she was doing there.