I think the idea is to have two lefty pinch hitters (Constanza and Schafer) and two righty pinch hitters (Laird and Reed). At this point BJ is there as a defensive replacement/pinch runner. We have three potential pinch runners (Constanza, Schafer, BJ). I think in their analysis of the series, the Braves brass concluded that they would have to manufacture some runs against this Dodgers' staff and that most of the games would be close. Hence the overload with respect to potential pinch runners and defensive replacements. In a one-run game, any of Gattis, McCann, Chris Johnson could be pinch run for. If Laird or Reed gets on base, we might burn a pinch runner there too.
I think the big surprise in this series will be our aggressive baserunning. We didn't do it all year. But at the very end against the Phillies we did a lot of running. The roster construction and how we ran in the Phillies series point in the same direction. I think this makes sense as a strategy given the quality of the Dodgers staff. Btw their bullpen is very good too, now that Brandon League is no longer being featured.