Been thinking about games where we could rest Carroll, typically those where we would need to unlock a stubborn defense:
-------------Reina
----Kelly--Carra--Dann/Sakho---
-Johnson---------------Enrique-
-------------Lucas-------------
---Henderson/SG---SG/Adam------
-----------Meireles------------
----------------Suarez---------
Given that Kelly can bring the ball up from the back, we can easily have 8 attacking players. I know Gerrard is not perfectly suited to the left of midfield, so if he is partnered with Adam they would switch (Adam is left-footed), otherwise leave Henderson to cover the right. If we need to get more defensive we can sub Adam/Henderson for Spearing and change to a midfield square with 2 holding mids.
Having said that, opponents that park the bus may bring out the best in Carroll, as we will have lots of opportunities to float the ball into the box from deep/wide areas.