There was a lot more wrong with that whistleblower's complaint than just that it was second hand information.
1. the complaint was written by lawyers paid for by Soros, it was a polished legal document, but with factual errors
2. Soros has billboards around Langley saying that they will pay for leakers and whistleblowers, i.e. make money, get Trump a two-fer.
3. Komrad Brennan likely setup the CIA whistleblower in the Whitehouse to spy on Trump
4. Rudy said that there are many errors in the Complaint, so how is it "credible"?
5. McGuire needs to stop the leaks and punish the leakers