If it would have actually been an email amongst the many hundreds I'm sure JT receives every day, and was not specific or direct, why should there be any weight given to that email? To me, personally questioning players and possibly bringing it up in passing in a meeting should be more than enough.
Filtering stuff like that is for the compliance department, right? If they got word of it as nothing more than a vague email similar to hundreds they have received before, why should it carry any weight?
I don't know, but for me, it just seems that this is the direction the allegations are coming from. A true inside source that knew names and individual circumstances seems highly unlikely, unless squelched by the Feds. In which case, there should be no real problem if the silence was directed by the Feds regarding an on-going investigation, right?