The Marlins pitching staff has struggled as a group in 2018 and any addition can only help a group that desperately needs it. Despite a recent string of above average starts, Miami could certainly start to take advantage of one of their highest paid players.
Outside of Jarlin Garcia all of the Marlins starters have an ERA above 4.90. Simply put this is not good. Chen has a career ERA of 3.90, an entire run lower than what some of the Marlins starters are currently allowing. Even if Chen comes back and ends up with an ERA between his career number and what the other starters are allowing it is a win.