This is an interesting one. Bieber was one of the best pitchers in baseball before he got hurt but he is still rehabbing from his Tommy John surgery. Should be back soon so I guess they are chasing upside here.
He has a player option for next year so it seems the thinking is he will either come back and be great for us down the stretch and in the playoffs and then leave as a FA or he will struggle and we will have him next year with another offseason to build back up after TJ surgery under his belt.