No way that Palpatine will appear at the beginning! It is the impression that Sidious himself called Cairoren. It is the same for Sith that the Sith chooses someone who has some power for apprentice. Well, is it more of a Sith contract than a Sith training? In other words, kill Ray and revive it in Final Order.
At this point, she would have told Len that Palpatine's own grandson. The place that does not say over the communication machine is clever. Ray advises Len that he can't keep up with the Sith as a threat, but Len himself has read that Sidious must be able to abandon Ray with a strong force. In fact, Ray may be stronger than Ben Solo. It must be cleverly hidden from Palpatine's understanding. After the final order was completed, we were planning to betray Palpatine together. I have just defeated a snork, so I have some skill.
However, Sidious understands the extent. First, regain the final order, pretending to be Cairoren, recognizing that he is the only one capable. After that, it was used up, so I thought about manipulating Ray and betraying it.
Eventually, we decide to pick the two winners as the new emperors. It is a common practice of Sidious to stimulate both sides. If his grandson Rey fought against Vader's grandson ... Sidious laughs forward. I hope they can both be emperors, but that is against Sith's rules. The Emperor's throne is one seat, and only one Sith can transfer.
The same goes for Luke and Leia. After his death, the emperor wonders if they were both Sis, considering that Vader had two offspring. If both of them turn to the dark side, they are worried that they will come together and approach the master. After all, only one successor at a time can be the successor of a Sith.
Palpatine follows the Sith's rules. I've been a winner for many years since I kept it.