I would guess whether or not another starter is used will depend on how Nola does tomorrow. I would not be surprised to see him start Saturday against the Cardinals.
Looks like the starters for the Mets games will be Nola , Anderson, Wheeler, and Eflin. I'd guess that gives us Moore, Nola, and Anderson for the St. Louis series.
The games tomorrow should be two 7 inning games, so it saves some innings on the pitching staff.