The idea of dying and coming back is what makes the Halloween films work.
I was offered a choice of a flat salary up front or a percentage of the film's future earnings. I took the up front money. Nobody could have figured what Halloween would ultimately become.
I'm hardly physically right for the hero parts, now am I?
The process of building a part doesn't really stop.
I believe you can frighten people without showing their heads caved-in.
Loomis has always felt himself responsible for the fact that he did not stop Michael when he first murdered his sister, and so he's got that guilt to live with.