Exactly. Whether you believe the number is 13.5 or not is nearly irrelevant. All indicators(scouting reports, basic stats, advanced stats) are that Barney is a terrific defender and has been his entire career. Similarly, indicators are that Cabrera is not very good defensively and hasn't been for most/all of his career. Make your own judgement as to whether that closes the offensive gap, but the "defensive metrics aren't perfect, so there's no way an offensive gap could be closed by them" is just anti-logic. What, now you're saying you won't accept the argument of "defensive numbers can't be accurately objectified, so they have no comparative value"?