Jpe’s running mate will be whoever the DNC or perhaps Obama or the Clintons assign him.
I do think you're right to say that, though I would quibble that Perez' DNC isn't a commanding player, due to "the perception that it hasn't recovered from 2016's self-inflicted blows," fundraisers say.
Barry, HRC and Slick are in combination the Dems' tour de force, which is to say that they represent the (Rockefeller) Deep State interests for the Dems. They're all three bastard Rockefellers (as is Kurt Russell) and of course, the maxim since Nelson Rockefeller--who tried so many times and so many ways--has been that the Rockefellers can't win an election under their own name.
And... BTW, who is allowed to sit, dine, toast and stand at the queen's right hand?