His name was Kabr. He wasn't my friend but I knew and respected him as a Guardian and a good man. He fought the Vex alone. This destroyed him. In the time before he vanished he said things that I think should be remembered. These are some of them:
"In the Vault time frays and a needle moves through it. The needle is the will of Atheon. I do not know the name of the shape that comes after the needle.
No one can open the Vault alone. I opened the Vault. There was no one with me but I was not alone.
You will meet the Templar in a place that is a time before or after stars. The stars will move around you and mark you and sing to you. They will decide if you are real.
I drank of them. It tasted like the sea."
That is all I can remember.
-Pahanin
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When you mentioned that when Kabr's ghost possibly turned into the aegis. Well, that actually makes sense cause if you go through the raid there are 6 aegises. Which could mean that the entire team was lost in time and each of the ghosts turned into an aegis when infused with vex tech. So with that being said, all of the ghosts did this to create weapons to stop the templar and atheon in the future.