In reference to the "accepting of synths" part, I meant that the group didn't care if you were a synth - so if one of them were open about it, they'd be accepted nonetheless, due to the fact that Eden wasn't even human they're far more accepting of Ai or synthetic life forms than most groups are at this juncture. 
But yes they have no way of proving their existence, or who is one, and who is not (barring a bullet) but they are accepting of them, if they decided to divulge their existence. 
Anyway, I'll add some more to the sheet.