Man, I hope it's Capt. Kelly. Just because it would be so nice to have a scientist at that level. He could be for the Democrats what they hoped Dr. Oz could be for Republicans, but Dr. Oz is weird as fuck.
He's my pick as well, because I think he's a good, sharp guy, and I think he'll help the ticket the most. If I wasn't concerned about them winning, I'd probably pick Buttigieg. Kelly is a little more conservative than I'd prefer and Pete just impresses me every time he opens his mouth.
He was a McKinsey fellow and contractor for the CIA. He has the support of (and he supports) a certain sector of elites from within the intelligence and foreign service world that I don't trust, or wouldn't trust in the office of president, which is a civilian office. It's not that the CIA and McKinsey fellows don't have their place in government, I just don't think that place is in the big chair. That's a bit too much like putting the fox in charge of the hens. I guess a better analogy would be that it's like putting a fox in charge of the foxes, when foxes have been traditionally been under the charge a creature whose conscious is beholden to those who domesticated it, a horse for example.
I don't like anything about his meteoric rise without any accomplishment or political success to speak of, how he was declared winner in Iowa in 2016 despite having less support by every concievable metric, and then how once he was the presumptive frontrunner by the punditry, it was just three or four phone calls and then he's just out of the race, along with Harris and one or two others, they all fell in behind Biden, and that was it for Sanders.