Tracking decades of allegations in the Boy Scouts - Spreadsheets - Los Angeles Times
Most of the cases were opened in the late eighties/early nineties.
Plus, you can't prove that most, but particularly not all, of the boys molested before that were molested by gay men. Most states had sodomy laws prior to 1980 which meant it was illegal in most states to be openly gay so it is unlikely that an openly gay man would have been a scout leader. I'm willing to bet that most of those who were molesting those scouts were in marriages with women, and even had children and many likely even condemned homosexuality. Pedophiles are not deemed heterosexual or homosexual by what sex/gender of child they molest.