“Managing money is in my blood,” Gross, who is the co-founder of Pacific Investment Management Co., told Barron’s this weekend. Gross, the bond market’s most renowned investor, quit Pimco for distant rival Janus Capital Group Inc (JNS.N) on Sept. 26, the day before he was expected to be fired from the huge Newport Beach, Calif. investment firm he co-founded more than 40 years ago. “I was always an investment guy, and the other stuff: hiring, paying people, planning, and so on, became a problem for me,” he told Barron’s.