my theory: Zavala was a hero and survivor of Twilight gap, just like Shaxx, and was promoted to Commander of city defences. Saint-14 led a crusade against the Fallen, and supposedly killed a Kell. I think that the remaining Fallen who followed this unknown Kell joined/formed the House of Exile. it could also consist of Fallen from the House of Wolves who may have refused to serve the Awoken Queen. Cayde-6 found the Vault of Glass, but was overwhelmed by Vex before opening it. he lost a bet that forced him into Vanguard duty, of which he has 2 years left. I think he made a bet with Andal that he could beat him to the Vault, but Andal was killed by the Vex. so to honour his friend, Cayde went along with his forfeit. Ikora revolutionised the way that the Warlocks operate; she's more "in your face" at times than some would expect. she probably had a hard time from her fellow Warlocks, hence why she prefers solitude. she may also have been treated better by Hunters and Titans, which would explain why she still openly shows respect for non-Warlocks. Alpha Lupi was either a Titan or Hunter who could envision the Future somehow. I think he may have either been mad, or found something great. Jaren Ward owned the Last Word, and is the "father figure" who Raised Shin Malphur. upon his death, Jaren gives Last Word to Shin, perhaps to avenge his death at the hands of Dredgen Yor. god dammit Bungie why did you butcher the plot?!