Well, my good sir, it would seem that the time for thoughts, observations, and opinions is over. Time to reveal that evidence you've been hinting about.
She proved that there was variety. The people needed to pull this off would have to come from many different walks of life. Naturally, they would all have different levels of information, but this would still be a difficult secret to contain.
As any engineer knows, the more parts you have in a system, the more ways it can go wrong. This also holds true for secrecy. The more people in on a secret, the more weak links you are likely to have.