My thinking was Kieboom was going to get his play - and probably at 2nd - with a solid back-up while Asdrubal manned 3rd. But they signed probably the best "back-up" in Castro and flipped the script putting Castro as a full-time starter and Kieboom splitting time with AsCab. Part of this might have been the Nats excitement over Luis Garcia.
That excitement got to be tested early as Castro would go down in mid August. September was a glimpse of the future with Kieboom and Garcia both in the lineup. How'd it go? Ehhhh...
Luis Garcia was not good. But that's ok! Luis Garcia wasn't terrible for a barely 20 year old having his first cup of coffee. In terms of getting base hits he was pretty decent. It's just everything else that failed him showing limited power and little patience. But he didn't strike out too much so the expectation is that he'll grow into the role. All last year showed is he's not Juan Soto (which did disappoint some hoping he was going to be like a 90% Soto)
Kieboom on the other hand WAS terrible even considering he was barely 23. You lose a lot of leeway in those three years and hasn't shown anything at the major league level. Ok that isn't true. Last year Kieboom was proficient at taking walks and got himself an OBP that was ok. But nothing else worked - he didn't hit, when he did hit it went nowhere (1 XBH), strike outs were better but still too high, and his fielding wasn't stellar though he was learning a new position. It was so bad the Nats did "send him down" to get his head on straight. He was brought back (bye bye Difo!) and played until a bruised hand benched him for the last week. Maaaaybe he was marginally better.
Presumed Plan: Luis Garcia keeps playing second. Castro shifts to play a mix of first and third depending on who they sign and how they feel about Kieboom.
Reasoning on Presumed Plan: Garcia was better than Kieboom and while not good, he was good enough at 20, to see what he'd do at 20/21 in 2021 (HEY! LOOK AT THAT! THE 2000 BABIES ARE HERE!). You could probably make up some reason to keep him down at the start of next year that wouldn't be too crazy but the Nats have never been that type of team. Once guys are up they are up and get their chances (see: too many 5th starters that could have been cycled through faster). Castro is too good not to play and he obviously won't play SS, so that leaves 3B and 1B. If the Nats want to give Kieboom a full year you stick Castro at 1B. If not, or if you want to be pragmatic about both Kieboom and Garcia's chances of sticking, you keep Castro at 3B at least splitting time.
Problems with Presumed Plan: Simply put - Garcia and Kieboom could both suck. They were bad and terrible at the plate last year respectively, and there's no reason to expect a huge turn around. It could happen, yes. But neither of these guys were undeniable minor league stars (and even those types sometimes don't click). Most likely they improve slightly which makes Garcia a second Robles in 2021 and Kieboom barely hanging on to a spot. That isn't great.
If they both suck and you've committed to both of them (with Castro at 1B) the Nats are likely sunk. A three batter hole (if not more) at the end of the line-up is hard to overcome. If they both suck and you've kept Castro in a floating role then you can shift him in as needed but you'd still have one guy in the line-up that shouldn't be there. I know Harrison has signed but he's past his prime and isn't a full time guy
My take: Committing to seeing what you have with two youngsters in sort of overlapping positions is hard for the reasons I state above. A lot of building teams find themselves caught in these traps. But what are the Nats going to do. These are the two hitting prospects the Nats are counting on to fill gaps. They have really nothing else in a minor league system that is both kind of weak and pitching heavy. The sooner they figure out what these guys are the sooner they can plan out the "Soto is Cheap" future of the next few years. This is far from ideal but it's necessary.
If the Nats really want to be sure they can sign a 1B (see those ideas a few posts ago). They have Castro here. They brought back Harrison. The back-ups are in place. Commit to a 1B solution that isn't Castro/Harrison and that's probably the best the Nats can do.