Ehh... I don't blame Dusty for this one, it's his hamstring not his arm. Same thing happened to Jake and both of them occurred fairly early in their starts.
Maybe not this injury, but Baker definitely overworks pitchers. Scherzer averaged just a tad over 100 pitches per start this season. Scherzers next three starts after the Nats clinched, he threw 116, 112, and 87 pitches. The Nationals have 3 pitchers in the Top 10 of pitches per game in all of MLB this season. Add in Starsburg, who has a history of injury, and they have 4 starters in the Top 24.