Who's gonna switch to 5.5, and why?

[Rukelnikov]

So a Templar of Correlon and Kord will be very alike and that's bad but a Knowledge cleric of Selune and and a knowledge cleric of Gond will also be very alike but that's somehow different? You'll have to explain that one to me.

Because templariness isn't particularly related to Corellon's or Kord's ethos, while Knowledge is for Selune and Gond. So there is a reason in the narrative and won't be true for any 2 gods, only for those whose ethos overlaps.