Fair question. The short answer is crowd levels -- they're estimated to be reasonably low during Halloween week, then jump way up on Saturday. So we'd originally planned to spend just a few hours in one of the parks that day, catching up on what we missed or wanted to do again. Then I was able to get reservations for Oga's and for droid building on Saturday so we figured we'd head back to DHS for those, maybe catch some shows or whatever we could do in a few hours, then spend the rest of the day at the pool. Basically, with crowds predicted to be high, I don't want Saturday to be a day where I'm trying to make sure we see a lot.