The logic initially was 'Justiciar would counter Justiciar', which made sense even before the vote closed and we learned she had True Telepathy...
But honestly, I think a good number of people were having trouble realizing that the three metahuman powers we chose would combine into a single powerset ala Prometheus. I have to wonder if that influenced the decision to go for Justiciar...
Still! Narratively speaking it was also a good move that made sense, even if some people were motivated by spite towards Silvio, I think.
(Putting mad libs words together blindly) Mona... and Ellie... need to suplex... the Frozen Throne... which is making out with... Yellow Qilin.