And there are plenty of LHP in this division.
TB - 3 - Kazmir, Hendrickson, Fossum
Tor - 2 - Chacin, Lilly
Bal - 2 - Bedard, Chen
NY - 1 - RJ
That's 8/20 rotation spots in this division, and the Sox play those teams 18/19 times a year. That's good for 74 games, 40% of which is ~30 games for Wily, and that is just against the division foes.