SAN FRANCISCO — Daniel Susac‘s life changed in a ballroom at the Signia by Hilton in Orlando on Dec. 10. But he didn’t realize it at first. The young catcher was eligible for the Rule 5 Draft and got selected fourth by the Minnesota Twins and then immediately dealt to the Giants. As the dust settled, Andrew Susac, who was 3,000 miles away from that ballroom, saw a Tweet about the trade. The Rule 5 Draft is a bit of a niche event, and it doesn’t exactly get wall-to-wall coverage. Andrew called his younger brother to ask if he had in fact been traded to the Giants. “I don’t know,” Daniel responded. “Did I?”Andrew found himself in a unique position, and he realized he could go straight to the source. Oh, and that source happened to be Buster Posey.Taken in the second round of the 2011 draft, Andrew reached the big leagues for the Giants three years later and backed up Posey as the now-president of baseball operations led the Giants to a third title. He made 52 appearances for his hometown team in 2015 before bouncing around the big leagues for a few years. The two catchers kept in touch, and when Andrew...