>This may mean they can cross examine the original witnesses AND call other witnesses to refute the evidence from the House? (Ie whistleblower, Hunter etc).
I don't know about calling other witness's, but getting to cross examine those who have already testified is huge. That right was denied the republicans during the house impeachment process. If that can be remedied here, on national TV no less, it will be a humiliating experience for those reps who voted for the sham impeachment.