Buster Posey will stay as the San Francisco Giants’ “primary catcher” in 2021 and will get “the lion’s share of the reps” behind the plate despite the presence of top prospect Joey Bart, second-year manager Gabe Kapler said during his session with the media Tuesday. Posey, a six-time All-Star who is owed $21.4 million in what could be the final year of his contract, sat out 2020 amid concerns about the coronavirus pandemic after he and his wife adopted twin girls who were born prematurely. Bart, ESPN’s seventh-ranked prospect in March, was called up to temporarily replace Posey and struggled through a .233/.288/.320 […]