Thank you..Theory: They wont close the mountain until they have run water through all of the slides and tested them.
Because we've seen them change pieces of slides - and you cant do that with the ones in the mountain if you close the mountain.
You can see not only a crane but several boom lifts as well at the bottom of volcano. This is the only place in the Volcano where they can access any support structures if they need to change anything. Once everything is checked, the rockwork is placed. There's still a few pieces left at the wave pool, enough to cover up most of the missing area.