I think people may not understand the limits of "an FBI investigation" in this case. The FBI cannot issue subpoenas, the Senate committee can. The FBI cannot compel people to testify. Without subpoena power, the FBI cannot get phone records, email records or bank records.

The four people named by Ford have already produced sworn statements that they were not there, that the party did not happen, blah-blah-blah. They cannot change those statements without being under penalty of perjury.

The bet that should be made at this junction is whether one of the major Democratic operatives, such as Creepy Porn Lawyer, comes up with yet another delaying tactic at the last hour of the last day of the FBI investigation. You know they will.