"Then this is just a he said/she said deal. No way of proving what, if anything ever happened. At the very least, there is reasonable doubt, and so no way to get a conviction unless there is some other evidence."
Not necessarily true. While getting a conviction on a he said/she said rape case is tough, it's not impossible. All boils down to credibility on the stand...
But, in this case, witness credibility on the stand comes at a discount--given supposed memories formed by a ten year old brain & recalled by a sixteen year old one. In my mind, that is a bigger obstacle for the prosecution to overcome than say, a 28 YO testifying to events that allegedly happened at age 22.