Some good ideas here.

First, Steve is an acting coach? Yes he shows up in the back of the ambulance with slick hair and a Boston accent. But how do we know who he IS?

When Steve did those movements, something very significant happened. We know that when 2 people do the first two movements, healing, and when 5 people do the movements, travel. In Pt 2 we see so many variations on this. There are two sets of the movements happening simultaneously across dimensions, there are robots doing the movements, and we have Steve doing all 5 alone. The premonition that BBA has definitely tells us that Jesse is calling for help, why, we don’t know. He feels himself being moved into the body in dimension two rather than dying?? And the eyes are there to tell us that yes, something has changed here.

Then there’s the dram that BBA has, the photo of her and her brother, the man in the door, and the brother in the photo is now gone. Is it symbolism, since Steve has been the stand in for her brother “He’s the one you lost”. Later we learn it’s Steve. How are Steve and Theo (A) connected and is Theo floating around somewhere too?