Hi,
This action only get the first component on the gameobject, so if you have 3, 2 of them will not be called at all.
I think should only have one sprite per gameobject. Can you confirm this with on the 2d toolkit forum, cause if indeed it's a common use to have several animator on a single gameobject, then this action needs a way to reference a particular component, not just assume that just one is present.
Bye,
Jean