Osiris and the lighthouse

Bungie confirmed Osiris is alive. We don't know where he is. Just wanted to get that off my chest before getting to the good part. I recommend studying the history of the sunbreaker subclass. The sunbreakers were a group of rouge guardians who went to mercury if I'm not mistaken. In the trailer where you get the sunbreaker subclass, you appear to be in the lighthouse. We all know that there is a secret room under the lighthouse with a skeleton, some weapon crates, and a dead vex. We know that most of mercury is filled with floating vex structures. What if these sunbreakers came to Mercury and found vex and went to war with them. Clearly, they lost. That body could be one of the og sunbreakers. I once had a theory of it being Osiris and him being lost and forgotten under what appears to be his home but that doesn't work because bungie said he is alive. If I'm not mistaken, isn't the person who tells you what's up when flying into the Devils lair strike Osiris?