Apparently numerous people other than the whistle blower knew bad stuff was happening. Intelligence officers deal with information. Some direct, some not direct, that is the nature of the job. It now depends on if other people were in contact with the whistle blower and reporting what they knew and if they had first hand knowledge or not, and of what. If someone knows that telephone calls were being mischaracterized to move to a secret data system, this is an abuse of power and it is not "hearsay".
This is going to be very well investigated and the "hearsay" charge probably in the end, is not going to fly. We will see a parade of ex-intelligent officials chewing this over on MSNBC as this stroy develops and investigations are undertaken.
The Hill:
Former CIA chief and vocal Trump critic
John Brennan said Thursday he believes the person who filed a whistleblower complaint against
President Trump "deserves our praise and gratitude."
It does not sound like John Brennan, for CIA head buys into this hearsay nonsense. I am sure we will hear more from Brennan as this unfolds.