I guess I'm coming in to this with less than an open mind, as the theory, "Diane was the victim of sexual abuse, with Aunt Ruth as a silent witness", is the base of most of my ideas about the movie.
but if I recall, many theories don't address the presence of Dream-Adam as central to Diane's story -- which leads to the following gap:
If the beginning 2/3rds of the movie is Diane's dream, why do we spend so much time on Adam's story. Almost everything else features Betty, or is a short scene; but we follow Adam's entire plot without her...except for their encounter as Betty is taken to the movie set, where they share a long, long glance -- with Adam showing a confusing mix of sympathy, pity, or guilt.
Some things that I've been thinking about recently have pleasing implications if we run with the idea that "Adam = Aunt Ruth"
The germ of this idea came from a thread where the topic of "what does/doesn't support the Diane was Sexually Abused theory" -- more specifically, the idea that Adam's wife's sex with Gene the Pool Man, implies sex inside the gene pool, implies incest.
When Adam walks in on his wife in bed with Gene the Pool Man, their response was always completely unexpected and illogical, given the situation at face value. Going from memory, Gene says, "why not just forget you've seen it, it'd be the best way." Some of those lines make sense if its Aunt Ruth walking in on Diane being molested by (Adult Relative X -- Uncle/Father/Father's Best Friend/Grandfather, whatever).
I imagine it could be argued that most of the sex-related dialog has sexual abuse-related undercurrents/buzzwords, so this isn't strong evidence (though I'd say that this is strong evidence for abuse being a key element of the story). But if Adam = Aunt Ruth, it directly addresses that gap:
we're spending so much time on Adam in Diane's dream, because Dream-Adam is Aunt Ruth, and Diane's wish-fulfillment dream is that Aunt Ruth is forced to break her silence:
The stare, Adam's pleading look of sorrow towards Betty, is Aunt Ruth's guilt (or at least, the guilt that Diane thinks should be there -- its her wish we're watching, anyway).
It also gives a meaning and purpose to Adam's whole plotline, and is directly related to Diane (not just passively related to her because of its Hollywood casting/conspiracies imagery): he is forced to say, THIS IS THE GIRL.
So, what do you think; an adamant idea, or just bad espresso?
(I could go on with a parallel idea about how the other non-Betty character, Rita, has an equally-Diane-related plot -- how her trauma/amnesia dovetails with Diane's molestation/repressed memory, and that Betty is the safe/distanced character helping Rita through it...down to the sex-with-Rita (herself) that releases the path to Club Silencio, seen again in the real world as her pained, blurry masturbation (sex with, again, herself) which released her memories...and how all this is only tangentially related to the REAL events in the present surrounding Real Diane (a lover, a breakup, professional failure, being spectacularly jilted in public, ordering a hit)... but how that lack of connection to reality isn't a key problem, because the dream is her self eating her self, and it doesn't have to take any outside contact as anything but symbols...but I think that'd be pushing my luck).