hearings in public which the republicans very rarely did. Most of the hearings the republicans held were behind closed doors so we have no idea what the questions and answers were.

If a few of the ones in contempt of congress cools their heels in jail for it could be that won't look good on their resume and they'll come in and testify, or if they get huge fines for not testifying.

Reason they won't come in is they were complicit in the crimes.

is to do it under an impeachment hearing. Contrary to what many people are saying here, impeachment hearings carry more clout with the courts and give Democrats a better argument for the courts to expedite their decisions.

Republicans who ignore subpoenas will never go to jail nor pay fines, there is no one to enforce it.

Forcing Republicans to comply with subpoenas, to release documents to release the grand jury testimony, to release to Congress the entire Mueller report will be decided by the courts. This is why Trump/Barr is challenging everything, they want to delay everything in the courts until after the election. They don't even care if they win or lose the cases. Isn't the first voting coming this February?