[CaptainCrunch]

I guess I have a different viewpoint of it, in that if we're talking about the last of the Jedi, I tend to think at some point in order to establish Ren as a viable threat, he literally has to become hugely powerful. And to me that means killing Luke who would be a credible threat. That way we can have Rey battling against huge odds to establish the Jedi.

To have a old man going sabers to me and having rey there too doesn't make a lot of sense.

I'm still convinced that Snoke is the key based on what Solo said to his son about Snoke using him for his power. I'm convinced that Snoke is a con, a non force user that wants to rule the galaxy and needs a powerful force user to do it. At some point Ren will realize that and kill his "Master" and fully commit himself to the Dark side.