Except Perrin is talking to Flynn about him, and it sounds like Perrin already knows who he is before Flynn outright says he doesn't know why Rand would be carrying 'one of the Forsaken'. So, not a big secret at that point. Considering the casual delivery, it doesn't appear to be a state secret, especially considering that if Nyneave or Moraine wanted it hushed up, they needn't tell Flynn and wouldn't have. We thus know that an absolute minimum Perrin, Nyneave, Moraine, and Flynn knew, besides the 3+Cadsuane who knew Rand lived. Perrin and Flynn and Moraine not being trusting souls, I really can't see them taking the disappearance of Moridin casually. LAter after flynn, you've got Loial peeking in on Rand/Moridin while Nyneave is talking about how it is unfair Rand is getting worse while the other gets better with Flynn and Lan, nobody explicitly says Forsaken there but considering Flynn had already mentioned it to Perrin and nobody there reacts to Nyneave complaining about someone else getting better I think it is fair to say the circle of definite-knows isn't just Flynn, Nyneave, Cadsuane, Moraine, and Perrin but the gals but also Lan and Loial, and none of these people act like its a secret. That would really just leave Thom, Tam, and Mat as close survivors of Rands who didn't know about Moridin for sure.



As pointed out, more knew, and Moraine might like her secrets but it is a huge jump to assume she'd decide for no apparent reason not to alert some people if Moridin was suspected to have escaped. She might go to Cadsuane, but only being clued in about Rand would prevent her going further.



Again, they knew he was a Forsaken.