Two different Jacks! This theory explains The Shining!

I'd only vaguely heard of this theory before, so decided to determine its veracity by finding and combining its various components into one video.
In #TheShining book, Jack Torrance is writing a history of the Overlook Hotel. Stanley #Kubrick may have modified it for the movie so that he's writing a more personal story loosely based on his own experiences. So what we see in the film are two different Jacks: the unhinged psychopathic killer Jack (or "Mr Torrance"), and his chronicler, the more stable and presentable Jack the writer.
PS: Did he write this story for his wife, who's "a confirmed ghost story and horror film addict"?
PPS: Props to Rob Ager (check out Collative Learning (www.collativel...) and his UA-cam channel ( / robag88 ) for the Dopey the Dwarf and Playgirl magazine concepts.
PPPS: I think I first heard this theory on Marten GO's channel. Check it out. / @preserveddragons
#stanleykubrick #kubrick #jacknicholson #1980