The question was also asked over at BSDA, "What would you consider proof?" The silence was deafening--there were no responses to the question. It looks like there is nothing that could be revealed or brought forward that would make them believe that TS abused those under his spiritual care.
Innocent and cannot be proven guilty. Now there is a free pass that a lot of criminals would love to have.
Bonnie has already pointed out that these kinds of activities almost never happen in public places with witnesses. Most crimes, in fact, are done in as secret a manner as possible. For a reason...they don't want to be caught and punished. Yet courts try and convict people every day. The judge and jury were not present at the scene, yet the charge "You were not there so you don't know!" doesn't keep the guilty from being sent to jail. Evidence is collected and weighed, ALLEGATIONS are presented and rebutted, and the judge or jury has to decide who is telling the truth. Often without anything that the TS supporters would consider "proof" being available.
Anyone can be falsely charged. And it does happen. (But I would say that if a pastor has good boundaries and does not spend time alone with vulnerable people, his chances of being falsely accused are greatly diminished.) But when allegations come from numerous sources, over a period of years, it becomes harder to believe that they are all just vengeful parishioners out to get the pastor. And when there is an eerie similarity to the stories that are told, what is called a "pattern of behavior" looks likely, and the "weight of evidence" comes into play. I known of a situation where a pastor had allegations of inappropriate behavior in about every district he went to. Always with unbalanced women whose allegations would not be typically believed. Once--it can happen. But over and over? Similar story, similar description from the women of how he approached them, etc. Any church that discounts numerous "allegations" of abuse, waiting for the 3D, 4 color, live and in person proof before they take it seriously, will have to deal with the One who recommended that millstones be worn by abusers, if other children are harmed on their watch.
So no, an allegation by itself is not "proof". But you get a number of them together, and they can play a part in proving something.