Throwing another idea out there for the “your mother” scene, that ties in with “from a certain point of view” as well as with Kylo Ren: in an episode of Rebels, James Earl Jones as Vader delivers the line “Anakin Skywalker was weak. I destroyed him.” I’m not sure if the audio of the line could be found isolated from the SFX in the scene — and indeed, if Ady has an impersonator available, there’s no need to restrict himself. I’d just found out that JEJ voiced Vader in Rebels and went looking to see if there was anything that might be suitable, following the “your mother” discussion earlier.