You are absolutely right, they must ride with a
DAS card holder that has a valid return time. What I am saying is their return time is not tied to a particular DAS card holder. So let's use a real world example: Jan (has a DAS) Jen (doesn't have a DAS) Eva (doesn't have a DAS) and Chris (has a DAS) All get their tickets scanned for a return time for Indiana Jones and at the same time, Margo (has a DAS) who does know these people, but doesn't know that these people are in the park and happens to get a return time for Indiana Jones as well. Let's say that all return times are set for 3:00 PM for this example. Now Jan and Chris both end up not being able to ride due to their issues. Jen & Eva (who do legitimately know Margo, just didn't know she would be at the park that day and yes, at Disneyland this happens a lot) can still ride with Margo (who has a DAS) as long, as their return times are all valid and it is after 3:00 PM. It should be noted that if one person had a return time of 3:15 PM, all could wait until 3:15 PM to ride. Also, if just Chris was unable to ride, the others could ride with Jan. But again, neither Eva or Jen could ride without Jan, Chris or Margo. Also, if Margo did not have a return time for Indiana Jones, they would not be able to ride with her either. As the PP stated, this simply gives the non-das card holders some flexibility as to how to use their return time, but they absolutely cannot use the return time without a DAS card holder whoe also has the return time. As for where this information comes from, it is from the people in charge of setting the system up.