1. regardless if the alternate reality is without jacob or where the bomb went off, heres my question: Why is Locke still on the flight? If the islands underwater, i highly doubt Abbadon would visit Locke and tell him to go on a walkabout. My guess is its just coincidence or destiny. whatever theyre calling it.
2. so Flocke cant pass by the ash, ill live with that. the ash is placed there by people and Flocke cant enter the ring of ash. But what i dont understand is why he didnt simply ask Claire to move the ash or make a hole in the circle. She could walk through so she should be able to dispose of the ash.