Hello! My family (husband, daughter, son, and my parents) will be going to Disney December 2019. My son (5) was diagnosed with speech apraxia, dyspraxia, and has now been diagnosed with ADHA (inattentive) and ASD. I've been reading everything I can about the DAS system. I understand it can be used on FP+ attractions only and he has to ride the attraction in order to use the DAS. My son is currently 46" and will be able to go on most rides, I worry that he might not want to go on certain ones. How does rider swap and DAS work. For example, we have a DAS for a ride and he has a meltdown & decides not to ride it, can we still do rider swap? What happens if it's a non-ride swap attraction and all 6 of us are ready to ride, but he has a meltdown? I want to make sure I'm prepared as possible for anything that can happen.