I think they were able to figure out a solution to a technical issue they ran into while building the DL version, and it saved them the trouble of having to correct it for WDW. I'm sure they would've rather wanted to open both at the same time if they could.Because it should've opened in Disneyland first since they started construction first. Now it seems like they are focusing more people and resources on getting it open in DHS since the opening in California didn't go as planned.