They played over their heads first half, and the law of averages caught up with them second half. Call it "choking" if you like but from my perspective you have to be good to begin with in order to choke. The '05 Nats weren't good, just lucky.
Right. Even when they were in 1st place they were being outscored.
First half of the season they gave up 361 runs (14th) and scored only 357 (16th)
Second half, they gave up 312 (11th) and scored 282 (14th)
They were playing like a team that would end up at .500 (and should have actually finished slightly below). They were on the right side of a lot one-run games in the first half. Those things even out. Livo and Vinny broke down, the bullpen was taxed from the first half, they had no pitching depth, the "collapse" was natural and predictable, not a choke job. Those first-half stats were not those of a playoff team. They were the little team that could for what amounted to a short-lived, fun, and magical time that made the return of baseball extra special. But we all knew what we were really watching.