They will drag this out until it is too late for Trump to attack successfully the replacement....and then pull the switcheroo to every dems glee and Trump’s inability to stop the relief and the suprise train. He campaigned well against A, but will be unable to deliver a successful fight against a B in time for the election. And a few dead voters later, voila.
And if my recollection is correct, neither has ever dissed Trump. Which cannot be said of many of the VP contenders (e.g., Vance, Burgum).