Sundance is a very creative thinker, and his head is full of information. he is always building theories. I'd estimate that over half the time he is right. On this one, I think three of four were charged, so it fits. I don't think his redaction specifics are necessarily correct, but the names seem to fit. Papadoupolous, Gates, Manafort (all three charged) and Carter Page. If we believe the House report, the FBI inserted four people into the Trump campaign.
I think the intention wasn't to spy, as you know. I think their function was to cause the campaign to collude with the Russians.
Q said about the picture of the buildings - think about what that means. My first thought was that the meeting was not to be in (or was in) the skyscraper but in the building where the photo was taken from. Trump said he would never broadcast in advance and for security purposes I think this is a ruse.