Ah. I wouldn't sweat it. If you only get 1 pass it should be good for 2 adults to reride. If they give you one of the passes that says it is only good for 1 adult then ask for a second. Hope your DD is okay with that so no one has to ride alone.
DD here that's how I think the system is meant to be used, unless I'm misunderstanding it. Just seems to me like if we're all wearing matching shirts splitting up into two groups of four to get two passes for the same ride will be obvious and might get us in trouble with CMs, since we really only need one pass for both people staying behind to get to ride + one extra person.