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Can make you reach instead of getting down to the ball. In the abstract that's a massive consideration.
As it applies to Mangini, not sure how much it would change about what we saw, his covering his chin with his shoulder on a backhand, taking throws and two-hoppers without any give in his glove, etc.
If anybody has seen him dip the knees and get the CG to the ball, when healthy, would be interested to hear about it... can't even visualize that, though, any more than can do with a Branyan type... Mangini's a blocky guy into the bargain...
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And there's the 35-40 errors per 160 games...
Important factoid though.