They left two men on base every inning I believe from the 1st through the 5th.
Instead of being up 4-0, if you're up say 6-0, or 7-0 nothing the entire game situation changes.
Today being up "only four" early in the game doesn't guarantee anything...being up six or seven? Hard to come back and win from that.
Dunn himself in the postgame blamed all the runners left on base early as the main reason they lost. (Robin said it was the 10 walks by the way...)