It could be along the lines of the theory that Palpatine/Plagueis inadvertently created Anakin/the Chosen One. They thought they could use him, but in the end it was their undoing.
Maybe Snoke did bridge their minds, which inadvertently solidified their bond and made them become a Dyad in the Force. So Snoke/Palpatine’s own machinations led to their undoing once again. I mean, we basically get that theme already since Palpatine indirectly made Rey by having a child of his own.