I believe the original film focused almost entirely on the dyad. It’s why there are lingering threads of the two of them being on the throne together in the theatrical release despite no such footage existing. Kylo was probably focusing entirely on how they’ve always been the same person through the Force and it’s their destiny to rule together (Sith prophecy - the rule of two manifested into what it was always meant to be), and how Palpatine is willing to give it to them because of how weak he is. But then the whole “your coming together will be your undoing” twist happens.