OK, but that would have nothing to do with the Jays knowing about his changeup and someone getting fired because they weren't prepared for it - so it's a moot point.
You don't think the players and coaches weren't talking in the dugout about how good his changeup was last night and talking about how he's throwing it way more than he ever has in the past? I mean you can guess that they must not have been based on the results, but doesn't that just sound stupid? You don't think after about the 3rd inning that guys in the dugout would be talking about his pitch mix and what they saw at the plate? I think it's safe to say those conversations happen in every single game they play - or I'd be shocked if they didn't. People honestly believe that nobody in that dugout was talking about his changeup and it's usage last night? You think the coaches were preaching "stick to the original game plan - don't change a f***ing thing!"
Should teams ALWAYS be able to make in-game adjustments and start hitting better? I mean obviously that isn't realistic, or nobody would ever throw a perfect game, no-hitter or even give you 7 innings with 0 ER. There were 4 OTHER shutouts around the league last night. Why didn't those teams make in-game adjustments?
Obviously the answer is that even if you're trying to make in-game adjustments, it doesn't always work.