It's not-so-much luck driven as it is sometimes his flaws don't show as deeply. Erickson was the #3 starter on the 1991 Twins, not some proto-Brandon Webb type. He was lights out against right-handed hitting that year (.191/.255/.290 2.62 K/BB) and challenged against left-handed pitching (.295/.363/.424 0.89 K/BB). Erickson had a great power sinker and slider, but not much else and that's not a good arsenal for getting lefties out. Gibson is pretty much operating with the same pitches. And you could see the pluses and minuses really clearly in the Tigers game. That sinker he threw to get Miguel Cabrera to ground into a bases-loaded double play was a thing of beauty, and his three strikeouts were all people chasing sliders out of the zone. But it's harder to get an opposite-hand hitter to chase a slider out of the zone. Not impossible, Andrew Romaine did. But harder. Example, the Alex Avila at-bat in the seventh. Gibson goes up 1-2 in the count, and then tries to get Avila to chase two sliders out of the zone, to which Avila lays off. Then, he fouls off a sinker and nails a 3-2 changeup into the gap for a double. Long story short, there's a reason Gibson is carrying a big lefty/righty spilt this year, as he did most of the way through the minors. Brandon Webb didn't become Brandon Webb until he developed a better changeup in 2006 to hold lefties at bay. Tim Hudson has his splitter. Roy Halladay had his curve. But for every pitcher who figures out a new wrinkle, there are ten power sinker pitchers like Erickson or Jeff Weaver who keep heading down the same path. So the question becomes what trick can Gibson come up with to stop lefties?