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I definetly think theres skill, just far less variation than involved with defense.
There are so many different skills involved in catching the ball, and tons of different scenarios.
SBs are a straight line. The skill is ALL in knowing when to go. Otherwise its raw speed. Granted, there a lot of speedy players who are lousy at that and a lot who are great. I think it just outlines why there can be such a large gap in defensive skill.