Catcher Tony Wolters is the glue keeping the Rockies together, now more than ever. In the months after spring training was shut down due to the coronavirus pandemic, it was Wolters who offered up his services, often at a moment’s notice, when pitchers called him for a pitch-and-catch session. Playing catcher is one of the toughest, dirtiest, and sometimes, most thankless, jobs in sports, but you can bet Wolters is appreciated by his teammates. “Tony was a blessing to be around during this shutdown,” starter Jon Gray said Saturday as the Rockies held their first full-scale workout of summer camp at Coors Field.