NFL gave Vilma a sworn affidavit from Gregg Williams stating Vilma offered $10k to knock out Favre

so, the document that Goodell is using to prove his case against Vilma also refutes all his other allegations about the Saints bounty pool. has he stepped in it now?

That's why he didn't reveal it until now. The affadavit infers that Goodell has been lying about pay for injure all along. His star witness refutes pay to injure.