I think what he meant is that we don't have a good way of objectively dentifying what caused the Cubs to begin to play up to their "pytg. potential", if you know what I mean. Therefore we wind up attributing everything to "luck", a sort of catch-all phrase we fallback on when we can't explain the reason for or meaning behind certain phenomanon. I think the hope is that we can find a way to objectify that analysis in the future rather than saying "they just got lucky", which is demeaning in its own way. Luck is just a different way of saying variance. Players who hit .250 don't go 1 for 4 every day, and pitchers with a 4.50 ERA don't give up 3 ER over 6 IP every start. In the same way(or, "as a result" works better I guess), .500 teams don't alternate win-loss-win-loss all year. A different way to say it without using "luck", is that they "played to their potential". People say luck because the close games that make and break teams' records have a LOT of variance. I am not sure that is what everyone means when they use the term, but I'll play along. Assuming you are correct, do we have a way of quantifying or predicting this variance? What about for middle relievrs, which is the topic the hand? Also, would you be willing to concede that baseball in general is to a great extent influenced by this "variance", or do you think certain teams get "luckier" than others? And if it is the case that some get luckier, isn't it true that there is only so much you can do to build a team that wins the WS?