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Statistically speaking...fielding achievements do not follow the right-skewed weibull curve.  Why?  Because their performance is not bounded on the left by zero...fielding (at a position) is not governed by total runs allowed because no fielder can control total runs allowed.  Each position contributes a little bit.  As a result the walls are so far away from the distribution that it looks more bell-curve like even for a stack of players who are, as a group, the best in their field.
On top of that, fielding in baseball is not the only selector for who has a job.
Many players who get fielding time are not among the best fielders in the world...whereas catchers all have to be good game-callers because if they aren't their pitching staffs mutiny (see: Bedard on Johjima...instantly declaring him not a major league capable catcher)...many guys are on the team for their bat and do indeed play defense much more poorly than guys playing in A ball or even in American Legion ball.
So no...fielding skill is not a right-skewed Weibull.  It's potentially slightly skewed...but much more symmetrical than CERA skill.