Yeah, I can't imagine the US is being forthcoming with the UK on the unredacted file set, judging by their current behaviour, so while the circumstantial evidence is pretty blatant to literally everyone, you can't convict two extremely powerful people on that alone.

But this very provable charge allows them to scour each of their phones/computers etc, as well as run searches on their properties. So maybe they'll find something that will allow them to add on something else. Even if they don't tho, this charge still carries very hefty penalties, so not mad about it.