Boy, what a lot of discussion that’s taken place since I popped in last!
I guess it’s probably better to leave this alone as it is, more or less. I do wonder, Burbin, if it would prove doable to change that line as you propose. “We’ve become a dyad in the Force.” It’s a subtle thing, but would help the audience get what is happening in a way that fits in with the other pieces.
I remember wondering how that worked since they are different ages, it couldn’t be something intrinsic. I know Kylo says “become” in his first scene in TFA. Might be worth at least trying.
Snoke sure seemed to be a mere meat puppet in a cursory reading of TROS, IMHO. He’s every voice in Kylo’s head and essentially just Palpatine with a paper mask. And if that’s so, it makes little sense that Snoke seemed acutely aware of Rey and Kylo’s connection and Palpatine seems surprised by their dyad-ness. Unless the dyad thing was just like, “Oh, well I didn’t know it was THAT far.”
All this is why TROS initially made me feel like Doc Brown at the start of Back to the Future III.