Since we were seeing Caroline's visions, and Steve was there, yep, Steve was there. Yep, she only mentioned Bo.....after all, he was alone in the cell and in that room that was giving him electric shocks. She knew signs on the walls, could read what they said. Sure she saw Steve,. but he wasn't her focus. On that plane, it was all dark as the lightning kept striking, etc. And Steve WAS off to the side. But he was there.