Oh, BTW, throwing this out, the Destroyer was an eridian superweapon. Jack lied, it is hinted at A LOT
Anyway, the Sirens each have an element. 6 Elements as of BL:PS, 6 sirens
Maya is Corrosive, obviously
Also obviously, Lilith
Then, we have the less obvious choices
Steele is Cyro, since she can’t seem to use her powers in combat. That is because of the atmosphere. Also, the albinism slightly hints to it
Angel is Explosive - her abilities are mostly conjuring items, and explosive is the most physical. Also, Explosive tends to be the most obviously technology, and her abilities are technological.
So, now we have to find the current Explosive and Cyro.
We also see 2 extra sirens in the “Origins” comic (not counting the dead one that gave Lilith her powers)
Thus, they are Shock and Slag
Adding on to the theory, Aurelia may be the Cyro siren replacing Steele since we never see her arms and she is skilled in Cyro.