I think the problem with looking at 1-run game records and forming conclusions from that is that there are so many different ways to arrive at that scenario, without the game being a super stressful chess match. I don't think that a win in those scenarios necessarily equates to successful managing, and vice-versa. If the Royals had scored two more runs in the 9th of game 3, the Jays would have won 11-10. Within the lazy analysis of 1-run-wins-means-good-managing, that game would have been a tick in Gibby's favour.
I remember a study a while back that looked at Bobby Cox's record in 1-run games from one season to the next. In one season he had one of the best records, the next season he had one of the worst. It's just so random.
Gibby, like most managers, makes a lot of dubious moves. Yesterday he certainly Gibbed the most I've ever seen him Gibb, and he deserves scrutiny for that. In general though, it's quite possible that next season (assuming that he's around) the team's record in 1-run games might do a complete reversal for various reasons, and very little of that change will have anything to do with any "improvement" in Gibby's managerial style.