My suggestion would be that J (or someone else) attempt to explain that while his usual explanation makes sense to him and is 100% valid, it’s just not the type of explanation the cast members are looking for and would result in them not understanding his needs.
They could then discuss possible explanations that would still feel appropriate to S but would allow the cast member to have a better understanding of why he can’t be in a regular queue. Then he can still handle the call himself and retain his independence in that way.
If this still doesn’t work (for example, he’s not able to understand why his preferred answer to the question wouldn’t be enough) then unfortunately there would be limited options.
Someone would likely need to step in to explain S’s needs further or unfortunately from that explanation alone he would likely be denied
DAS.
But at the end of the day, Disney needs to understand why S cannot wait in a regular queue and if the information isn’t provided in a way they can understand then they won’t be able to approve him for DAS.
An individual asking for accommodations has two options, they can either advocate for themselves with the explanation they see fit…or someone else can advocate for them (someone who may be able to better explain the individual’s needs).
As an alternate perspective:
I don’t see it as taking away my independence to let someone else advocate for me because I see it as them having a better outward perspective as to how my challenges/needs in a queue present themselves. They’ve seen how I/my body reacts in a queue environment / when overstimulated, which in my opinion makes it easier for them to explain to the cast member for me. I know how I feel internally, but they can better describe how it presents outwardly and how it impacts myself and those around me.