Originally Posted by SMcGavin
Nothing wrong with teaching (in any field) but it's not nearly as useful as actual experience.
I actually don't think they're separable. Rolen's seen a ton of pitchers a ton of times--Dusty and Jacoby haven't so they're not going to be able convey pitch by pitch breakdowns for him. Sure, the only way he'll learn is experience, but having an encyclopedic knowledge of current active pitchers' repertoires is a pretty valuable thing.