We know that the First Order and the Sith Eternal are analogous to eachother. They were intended to merge into a larger Sith Empire and take control of the galaxy. The only problem though is with whom at the helm? In The Rise of Skywalker we see two somewhat contradictory statements. When Kylo Ren finds Exegol and the Phantom Emperor it is stated that if he kills the girl (Rey) then Sidious will reward him with the Fleet, The Army and the resources to finally conquer the Galaxy and rule as the new Galactic Emperor. However, when Rey later arrived at Exegol Sidious tells her he never wanted her dead but as a vessel for his unlimited power.
I wanted to ask if there was any canonical source that stated that Sidious' offer to Kylo Ren was actually sincere and that if he killed Rey he would have truly been allowed to become the next ruler of both factions. Of course, we also learn that Ren intended to betray Sidious anyway. Was it just simple manipulation? Then why did Sidious groom Ren from birth to become a warrior of the dark? If all went well however, who would be the ruler of the galaxy? Kylo Ren with Sidious as Master and Apprentice? Sidious through a vessel? I don't want the explanation about the writing quality or inconsitencies. This is looking at it strictly in universe. What do you think?