If one's "confidential file" is made available to anyone else (are you saying all elders?), would that not constitute a violation of the member's rights?
As per WT policy, only the S-77 form (Record of Disfellowshipping, Disassociation, or Judicial Reproof) goes into the confidential file. In the form, apart from the persnal info of the accused, there is just one question:
Specify offense(s) for which disfellowshipped (sfl 12:2-39):
Here just the offense is mentioned, for e.g. Apostasy, Sexual Immorality. etc. No other detail about who did it with whom and all is not mentioned.
Elders are not supposed to keep any personal notes on the matters in the file. In all the JC's I have been, even as the Chairman, I never took any personal notes, so there was nothing to retain apart from the form.
If any elder has maintained any document on the case apart from this form, and in the future the accused files a lawsuit, the elder stands at fault. As per policy, no other elder is allowed to access this form apart from the Judicial Committee and the Reinstatement Committee. If the DFéd person accuses that the other elders have accessed his confidential file, then again, in a legal sense those elders will be at fault, not the WT.
Most elders that are selected in the JC are careful in these matters, and hence many disfellowshipping court cases are hardly won by any DF'ed person.