By Dave LewandowskiPublished: Sep 30, 2015Second of three parts looking at the Verizon IndyCar Series season of Juan Pablo Montoya through others' eyes. Today, chief mechanic Vance Welker.“Preparation,” Vance Welker says matter-of-factly.That one word would have sufficed in the chief mechanic’s review of the No. 2 Team Penske Chevrolet’s Verizon...