They don’t need the “whistleblower” any more. They have the original leaker, LTC Vindman, who gave the “whistleblower” the content of the call. It’s pretty obvious Vindman was plan B, but when all the conflicts and bias’ of the “whistleblower” made him useless, they needed Vindman. If it does turn out that Ciaramella is the WB, Vindman could be in serious jeopardy for leaking classified information, as Ciarmella was no longer CIA by the time of the leak.
No Eric Cinderella was still CIA at Langley ; he was no longer NSC.
That’s why Miskito had to be hired by Schiftt to alter the online form to allow hearsay.