is it "possible"? of course its possible. wirhlut being overly sarcastic there are a great many things that are possible, but not likely.
you referanced an occam's razor, the simplest answer being the most likely. the simplest answer is that the gb are old men with power, beholden to the idea that they represent the one true god and the standard set is the right one. they also may fear changing policy now would would be to admitt they were wrong before and thus expose them to liablity. those seem to be the most basic, logical reasons rather some secret fear of being exposed via a rule change they can prevent.
that is not to say i think its impossible one of them could be a pedophile. they are human and its certainly possible. it just dosent seem the most likely explanation for their reluctance to modify church policy.