Nothing would happen, you're not "IN" therefore you cannot say anything about them, everything is a lie. You're below female children even when it comes to status.
Maybe if you "come back" they'll take you seriously, but if you are DF'ed or even on your way to be DF'ed (people confess to many things in the judicial meetings or try to pull comparisons between them and another 'sinner'), once the elders decided you're going to be DF'ed, anything you say is irrelevant, including but not limited to CSA.
This causes some really interesting chain reactions though. You'll have someone DF'ed, they want to stay in, so they'll be coming back and repentant and then 6-9 months later they get reinstated, then a few weeks/months later someone else gets disfellowshipped, because once you've confessed or pointed out these things that others have done and not been punished yet, the elders will remember when you get reinstated. Then people start getting worried about the "spiritual health of the congregation" and it's all downhill from there, more comes out, the CO starts a witchhunt amongst the elder bodies and in the span of 2-3 years the entire congregation has been demoted, DF'ed or reproved.
F-in everyone in the congregations has a holier-than-thou attitude, until someone is in the hot seat, then the beans get spilled elder's wife is a drunk, she cheated with him, his kids had sex with their kids, he beats his wife - EVERYONE suddenly knows something about someone else.