Re: John Harrison was more interesting than (SPOILER)
It does feel like somewhere in the process they went from Harrison to the Khan/Harrison villain. Maybe as late as shooting the film.
I think the Harrison facade could have been done away with completely and wouldn't have changed the movie much, as well.
"I tell you what you all need, you need to take a thirteenth step, down off your high horse." - Hank Hill, King of the Hill