Well, what we do know from the report is that the 15 year old was in a very stressful situation, and not just standing there. It's a fact that different people will give a very different witness description of the same person. In a moving, stressful situation, I doubt I would have much awareness of how much taller someone is of me that clearly.
And if someone has reported a crime as being females, do you expect it to be reported as "posing as female.." when there is no actual evidence that they are posing as female? That's what I'm reading in this thread.