the article also points out that the Nats are 22d out of 30 teams in pitches per plate appearance, which helped Smith-Shawver keep his pitch count down to 86 through 6 IP.
And the pitchers are 27th in P/IP. Combined with that Darnell swing early and softly approach, it's why the opposing pitcher almost always has thrown fewer pitches than the Nat pitcher after 3 or 4 innings.