Trey Mancini already is embracing a versatile role with the Chicago Cubs. Mancini’s experience at first base, both corner outfield spots and designated hitter gives manager David Ross options for how to use the 30-year-old. Mancini is the eighth free agent the Cubs signed to a major-league deal since Dec. 14. “I have never played with any of the other guys that were signed by the Cubs this offseason, but I played against them and have such a high respect for all of them,” Mancini said Monday during his introductory video conference.