sure, there are grey areas and incomplete stories around sexual violence and I would never argue with that. But I find it hard to doubt the basic framework in a story of someone who was assaulted. And yeah, Getz & Grimes' closeness has been documented -- they left for California together in 1966 -- so maybe he wrote it down somewhere.
and not to pile upon Hubbard, but at the very least his drinking and cocaine use, and penchant for being rather 'out of it', are fairly well-established. Not that alcoholism/cocaine use equal sexual abuser, but people hopped up on shit do some very uncool things.