When watching guys field their positions on TV, it's easy to get lulled into complacency when the limitation is based on a lack of athleticism, and not a lack of coordination. If the errors and other visible blunders don't pile up, a substandard defender can go unnoticed for rather lengthy stretches.
Then somebody shows up and puts on a clinic, and it triggers a recalibration of legitimately good defense.
We saw that last year when Manny Machado made plays Conor Gillaspie couldn't during the same series. (We also saw it kinda work against Machado's superficial stats on Wednesday, when he made a throwing error after gloving a grounder that would have gotten past most third basemen for a single.