You know, both involving Arks, both set in a post-apo world.
So Rage is set on some wasteland with mutants while Brink is set in the sea with a population that is totally cut (travel or news) from the rest of the world, all these doesn’t necessarely nullify each other.
Anyway that is just my 2 cents theory, personnaly, I would love to see them related, it’s always a shame that a rich game background is only restricted to one area of the world.
. Probably for the same reasons that a lot of people think this is TF3.