Have you read the extended text to glory about patient E, aka Jun. I think that patient E is Cayde, before he was an exo. Patient E makes a comment about the experiment not being allowed on earth, seems like some sort of smart arse comment Cayde would make. He then goes on to say he doesn't want to do it but has no choice as he is in huge debt to Clovis Bray. We know Cayde was in debt to CB, and we are pretty sure CB put Caydes mind into an exo as payment of his debt. (Or something along these lines, I'm not a huge lore buff so not 100% on the facts) So I think given what we know, its to much of a coincidence that patient E was also in debt and under went experiments for CB to pay them off.