All theories are wrong; some are useful.
The Force should be beyond the ability of people to fully comprehend. I think the best way of viewing the Snoke lines is that he is identifying a connection between Rey and Kylo, but the full truth is not apparent to him, whatever that truth ends up being.
I think this is a really elegant explanation, and it’s how I feel about it too.
I never liked the rule of two, or that balance was something we could really quantify. I’m fine with the characters wrestling with these ideas, but the force is better when it’s beyond any one character’s comprehension, even if their hubris makes them think otherwise.