Struggling shortstop Marwin Gonzalez was optioned to Class AAA Oklahoma City on Monday. The Astros also designated lefthanded relief pitcher Wade LeBlanc for assignment. Corresponding roster moves will be made Tuesday. Astros general manager Jeff Luhnow said Gonzalez will be allowed to regroup with the RedHawks. The organization believes the second-year player is “going to be around for a while.” But Gonzalez’s batting average had fallen to .230 and he held just a .589 OPS after a hot early-season start, and he committed his eighth error in Sunday’s loss. “He’s been struggling a little bit over the course of the last month,” Luhnow said. Gonzalez, 24, was splitting time with [.]