‘‘Super’’ Joe McEwing knows something about leadership, having been a leader himself even as a utility player for the New York Mets and St. Louis Cardinals. McEwing, the White Sox’ third-base coach, was the lead-by-example type who used every ounce of energy to squeeze out every bit of ability in his body. Tony La Russa loved the way he went about his business so much, he requested a pair of McEwing’s spikes when the Cardinals traded him. He is a manager in the making — perhaps as Robin Ventura’s replacement with the Sox — and so he qualifies as one to discuss the subject of clubhouse leadership. It comes up now that catcher A.J. Pierzynski is gone. Pierzynski was a tireless worker and iron-man performer who spoke his mind when things needed to be said. He won a World Series with the Sox in 2005, which is worth instant cred in any clubhouse. There are no concerns among the Sox, however, that nobody is left to hold the reins. ‘‘A.J. led by being on that field every single day,’’ McEwing said. ‘‘But with Dunner [Adam Dunn], Paulie [Konerko] and [Jake] Peavy, we have a great group of quality veterans who are true pros. You move on and make the best of every situation.’’ The Sox say they’ll have leaders spread around the 25-man roster with veterans Matt Thornton and Jesse Crain in the bullpen, Peavy in the rotation and Dunn, Konerko and Alex Rios in the every-day lineup.