I recycle starbucks cups, tons of them, I collect when cleaning an office- They serve the purpose, but I think planting directly in the larger pot is best for the cutting. there is too much trauma in the transfering from cup to pot. To help with curiosity about the roots, cut a window in the pot, and line it with clear plasti (2 layers of kitchen use) taped with duck tape to close the hole, you ca still see what is going on inside but will not disturbe the plant.
Steve, put it back in warm moist chamber, in moss, and it should send out more roots, once recovered - I know the feeling. ha
ng in there, dear fig friend.