Of course no data will show anything with certainty. But, were I looking for overusers or unnecessary cases, I might look out for people who spend dozens of days per year in the parks and visit for long hours. I might pay attention to people who always use return times right on the dot and make another attraction selection immediately.
In my mind, DAS covers people whose visits might otherwise be more limited or more chaotic. Those things I mentioned above (keeping a tight schedule, tolerating crowds) would suggest a user might be able to tour in a more normal way.