Your quote does not indicate that Twiggy entirely, mostly, or predominantly composed any album. Manson uses the phrases "we" "our guitar player" "Twiggy and I". What you inserted into the article indicated that Manson had minimal, if any, input.  

 : My intention was to fix the lines indicating that Reznor was the primary songwriter, not to minimize Manson's influence. I didn't insert anything to try to push Manson out, rather I edited that paragraph to give him and Ramirez some deserved credit. Ramirez was the primary songwriter and Manson was the primary creative force on the album with contributions from others. At this point there needs to be some sort of paragraph in the article about that particular period.