There are expectations and then there is reality. The expectation, when the Giants signed Zito to a seven-year, $126 million contract, was that his time with the Giants would at least approximate his career to that point with the Athletics. Then, reality.
The same is true for just your run of the mill, every-day at-bat. The batter, catcher and umpire all have expectations of their own. Only the pitcher, however, makes it a reality.