Why the Cubs Traded for Aroldis Chapman

Yesterday, the Cubs completed a trade for Aroldis Chapman.  The Cubs' bullpen has been the weak spot for an otherwise excellent ball club.  The Cubs' bullpen ranks 20th in the majors in FIP and 14th in ERA.  There's no question that Chapman immediately makes the Cubs bullpen better.  Chapman has a career ERA of 2.12 and a career FIP of 1.96.  He's struck out over 15 betters per 9 innings in his career.  He throws the ball really fast, so much so that when MLB introduced Statcast to the masses last season, they had to include a Chapman Filter on the leaderboard of fastest pitches thrown, because otherwise the leaderboard would just be tracking every fastball Chapman pitched.  He also features a devastating slider.  Suffice it to say, Chapman is one of the most-dominant, most-feared closers baseball has ever seen.