Kevin Wendell Crumb, or God-Emperor Leto Atreides II?

Rating: 6/10 (19 May 2017)

It just so happened that I read Frank Herbert's "Children of Dune" a few days ago, and it's story line is still so vivid in my mind... The movie is OK, and the quality of it is not the thing I want to discuss here.
What I do want to discuss is: are the themes and premises behind this movie borrowed from Frank Herbert? And how come no one talks about this?
It's funny, because:
1) Leto Atreides II, mentally superior, prescient "prince of Dune" was also "a split personality", so to say. He had access to all of his ancestors' memories. In Dune series, there is always a danger with prescient people that they may become an Abomination, meaning that one of these ancestors (especially an evil one) may take a hold of a person's consciousness permanently, subjugating all other personalities. In "Split" this would be similar to Denis, Patricia and the monstrous 24th personality - the Beast.
2) The Beast at the end of the movie becomes a superhuman. He has an impenetrable skin, runs fast and can climb walls. Guess what Leto can do after his union with sand-trouts of Arrakis? His skin is resistant to knives, he can run at great speed, and he can jump from dune top to dune top.
3) The funniest of all. James McAvoy played Leto Atreides II in 2003 mini-series "Children of Dune".
What's your take on this one? Please share :)