Rumors surrounding the Giants and free-agent starting pitcher Framber Valdez have begun to circulate.Giants broadcaster Mike Krukow joined KNBR 680’s “Murph & Markus” on Thursday and was asked about San Francisco potentially pursuing the star pitcher. “Well, I hope so,” Krukow said. “I think he’s one of the top pitchers in the game, and I like his style because he’s extremely unique. High three-quarter release, big curveball — one of the best in the game — Clayton Kershaw-type curveball. He not only gets strikeouts, but he gets ground balls.“And he also has one of the best sinkers that gets lots of ground balls, and he’s left-handed. I mean, what’s not to like?”Signing a two-time All-Star pitcher typically is a no-brainer, but there are questions about Valdez, who had a controversial cross-up incident last season with the Houston Astros.In the fifth inning of the Astros’ loss to the Yankees on Sept. 9, outfielder Trent Grisham hit a grand slam off Valdez, who threw a pitch even though his catcher, César Salazar, motioned him to step off the rubber.Two pitches later, a frustrated...