He does, but Nats are a wild card contender and while they may or may not be stupid enough to go all-in with that, their ability to act like they might want to, plus Thomas's additional year of control, could make it pricey.
Tommy Pham is still a great fit as well.
Given how good this year's team is, overpaying a bit to fill that hole seems worthy and inevitable, versus settling for someone who's barely an upgrade or doing nothing like last year (as far as RHB that is).