Yes I do have specific knowledge of this altthough I prefer not to disclose the source or TOC. The figure of 51% is irrelevent as those were figures I plucked out of the air. The bottom line is with at least one TOC I am 100% sure of and others I have heard whispers about if an internal candidate scrapes through interview and assessments they will be offered the position over any external candidate.
I'll second the suggestion that this is nothing more than messroom hot air, most probably from those with nothing to do with driving or recruitment.
If a vac is opened up to external candidates, then they've as much chance as anyone else, as many of us who are actually drivers have proved.