Misch had been with the Mets since 2009, claimed off waivers from the San Francisco Giants. The lefty enjoyed two respectable campaigns with the Mets, owning a 4.00 ERA, 1.32 WHIP, and a 2.00 K/BB in 96.6 innings from 2009 to 2010. However, Misch couldn’t find a fit with the team in 2011, leading to multiple DFA’s and a forgettable 10.29 ERA, 2.14 WHIP, and 1.25 K/BB in just 7 innings.
Mike O’Connor was first signed by the Mets in 2010, but never pitched above Triple-A. But in 2011, the 30 year-old lefty was called-up on May 7, and pitched well for the Mets–posting a 2.70 ERA, 1.20 WHIP, and 2.67 K/BB. Despite his success at the Major League level, O’Connor only posted a 5.22 ERA, 1.45 WHIP, and 3.47 K/BB in 60.3 Minor League innings.
It’s possible either or both pitchers can still be re-signed, but it’s fair to say both are very replaceable.