Ash is NOT an "idiot" at all
What's so "blatantly stupid" about him in AoD? Nothing. Nada.
He got the incantation wrong, but there are several LOGIC reasons for that anyway:
1- In "The Evil Dead" (first movie), we can see that Ash has problems with foreign languages and he messes a greek quote very bad.
2- He remembered MOST of the incantation: "KLAATU VERATA NI---".
3- The process of duplication (Bad Ash), which occurred just hours before, had temporarily messed up with his mind anyway.
Beyond the fact that he didn't remember PART of the LAST WORD of the incantation, he's badass and smart throughout the movie... so why are people convinced Ash is an idiot?
Don't forget he has been enslaved at the beginning of the movie and tortured for WEEKS. And don't forget the countless traumas he survived during the first two movies.
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Well, this is my NEW personal canon: just mine.
It's a theory.
It's not a gospel.
It's not canon.
Hopefully you'll like it the same way I like it.
1 UNIVERSE
1 ASH
1 CABIN
1 STORY
Here we go:
THE EVIL DEAD PLASTIC UNIVERSE THEORY
http://evildeadarmyofdarkness.blogspot.it/p/evil-dead-plastic-universe-premise.html
Have fun, have a good read. I'm just a passionate fan.
Thank you so much.