My interpretation (with this trilogy of edits) is that the dyad began its inception during the interrogation scene between Kylo and Rey way back in TFA. The seeds were planted there for the dyad.
And then in TLJ, Snoke bridged their minds together so they could now Skype call, which really got the dyad ball rolling. (Not really the smartest plan ever, but hey. Snoke is a fool and thought Kylo would finally try to surpass his grandfather instead of doing the same killing-his-master thing Vader did. It’s fine.) But then they could continue the force Skype calls after Snoke’s direct influence was gone, because the dyad had become that much more powerful and just naturally flowed to take that form of communication. It’s a very Force-ey unexplainable spiritual thing, and I’m fine with it. (Emperor or Snoke didn’t know it could still go on afterwards, maybe?)
And finally, The Emperor wasn’t controlling Snoke’s every move; he just “made” him, as in trained him. And set him up as a figure head in the First Order, as Emperor was trying tirelessly to get a working clone of himself in order. So, he didn’t know what exactly was going on in Rey and Kylo’s heads, other than what Kylo was directly telling the Darth Vader helmet and to Snoke (who, I guess, was relaying it back to Palpy.) The Emperor knew they had a bond, he even says it’s a bond. He’s just surprised that it’s as powerful as it is, sending items back and forth. (He also didn’t know Ben was there in the other part of the building, so that’s also why he was shocked when the Skywalker saber disappeared) He might have only known that Snoke bridged their minds, not that it had materialized into a full blown “unseen for generations” style dyad.
Something like this. I dunno. That might not make sense, or somehow contradict itself somewhere, but hey. It’s what I have to work with to make these movies connect properly.
I’m back and forth on the “every voice inside your head” line. On one hand, I can see how it’s kind of unnecessary to have both “I made Snoke” and “I’ve been every voice you have ever heard inside your head” lines back to back. One or the other is enough. But on the other hand, having both lines there doesn’t really take away anything for me, it’s just more explanation. I don’t mind the fan servicey presentation of it. Maybe, yeah, just remove the Vader breathing perhaps, if anything HAS to be changed there.
Basically, I’d only be upset if both lines are totally removed. I need SOME explanation in the actual film. We need to know that Palpatine “made” Snoke. It is important in trying to make this all makes sense, to directly connect Palpatine to Snoke. Not just the First Order, but to Snoke. At least for me. With the removal of the jar of Snokes in this edit, it leans more towards The Emperor meant he merely propped up Snoke, rather than literally created him, which is what we all want to have happen in Ascendant. But we need some of this dialogue to explain it. It’s messy and a little confusing and maybe still unnecessary to some, but I think it should be there. I’m also open to repurposing the lines for later on in the Vader helmet scene, like has been mentioned. Although, it would be weird to not have the Emperor tell Kylo at the start… but I digress. Either way, the line(s) need to not be completely removed, I feel.