Carla.
This has happened. A pioneer (what else? ) over a period of decades had a reputation for being over familiar with sisters and there were rumours of sexual activity and relationships with female bible studies - and at least one sister in the congregation. It took decades for him to get caught and dfd.
Basically the sister confessed to her adultery with him. He said it was a fantasy on her part.
She had a reproof and nothing happened to him. Years later a "bible study" came forward and he denied but got DF'd on the basis of there being more than one witness.
Don't forget you can have "two witnesses" to separate but similar events to make it count in JW land. (Usually collusion is checked out) This was not always the case.
This is how smokers are sometimes caught when they deny. And if on two separate occasions with separate victims a jw pedo is caught he can be done judicially even with no confession.