Just think about the character similarities
Vex=Geth
Hive=Collectors
Cabal=Krogan
Fallen=Salarian
Also supers and how specific class come into play and councils with the three guardians and the three and later on 4 council on the Citadel. Also the citadel and the tower and the reapers and the taken. There are so many similarities it's crazy
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Fallen=batarian more likely.