Caiatl's vision of the religious practices and beliefs of the Psions tell us they believed everyone is connected in death. This instantly drew a connection to the Final Abyss the Disciple talked about which turns out to be the true meaning of the Final Shape. We know all beings in the Destiny universe came to be after existence bloomed out of the original Garden where the flower game was "played." Many beings seem to have traits from Light, Dark or some other kind of paracausal function (O Worm Gods and Ahamkara mine) This leads me to think some beings developed with inherent "Winnower ideologies" such as culling, finality, and death. The Witness is described as a cacophony of thought. It's obsessed with finality. And the Psions, on their own devices, seem to gravitate toward this. Prior to being assimilated, they too were obsessed with finality. Under Calus, they are led back to these beliefs, as it's their nature to gaze beyond and now, the Black Fleet takes an interest in them. Perhaps Psionic power has a secret [b]dark[/b] nature to it? Anyway, I'm certain the Witness will attempt to establish a link with them as it did with the Scorn.