I think what happens in a judicial committee meeting is that the person's whole attitude (and of course loyalty) is explored and it is usually for other reasons that one is technically disfellowshipped.
This is always the case. No one is actually ever disfellowshipped for something the DO. Rather, a much more subjective method is used - the elders decide on your ATTITUDE.
This allows the elders a free reign in deciding one's fate. That's another reason why appeals rarely work. There is little that is OBJECTIVE to defend. Unfortunately, experience shows that most victims of a JC have been judged innocent or guilty before they have even entered the room and opened their mouth!