There is a saying that knowledge is power which basically means that with knowledge one can achieve their goals with much less physical strength than they would have exerted without it. Well, at least in this context that's what it means.
These four individuals had an educational session the previous night about Nocru's keystones but didn't necessarily come up with a game plan to find them. That's because none of them actually had an idea on where to start. The keystone in their hands was entirely found by accident but accidents cant happen twice, right?
What they didn't realise was that someone they had left out of this session had a much deeper connection with this keystone. That person happened to be Rui Yewan who had been robbed of that very keystone last night.