Close, but I think everyone is missing the boat on the SANE nurse's role here, it is compassion, yes, but it is more that that - it almost moves to the "advocacy" position. I have done some crisis work, and at that stage our job is not to judge the veracity of the complaints or to try to get to the bottom of the present situation, our job is to more like being an advocate.
It is not the SANE's nurse to judge guilt or innocence, or come to a conclusion. It is her job to treat the victim, make observations and collect evidence. If a SANE nurse decided she had to figure out the guilt or innocence of any party, or whether the client was lying, nothing would ever get done.
As such, I think the SANE nurse did exactly what her job was. The finding "consistent with" was exactly the right finding. That has a specific legal meaning, it is the media that has twisted that fact into the lie that it mean "the evidence shows".
BTW I think the boys are innocent.
I agree with all of that, except the part of the SANE nurse serving as a de facto advocate of sorts. The system has victim's advocates, some specializing in rape, serving a separate function from the SANE nurse. The rest of what you say is dead on correct.