In his return from the DL, Ryan Dempster shut out the Mets.
If the Mets traded for him, he would be shutting out other teams for the Mets.
Dempster is very consistent, and he leads the NL with a 1.99 ERA. Despite his ERA, Dempster's record is 4-3, thanks to very little run support from his teammates. Since the Cubs are out of the playoff race, they are looking to trade Dempster for some prospects.
Dillon Gee is now on the DL with a shoulder injury, and the Mets' rotation consists of Jonathon Niese, R.A Dickey, Chris Young and Johan Santana. The Mets need another starter, and even when Gee returns, they would benefit from having Dempster replace Young, Niese or Gee.
The Cubs' pitcher has a 1.01 WHIP, and opponents are hitting just .204 against him. Dempster isn't a strikeout pitcher (70 strikeouts in 86 innings), but opponents make weak contact off of him. He also rarely walks batters (22 walks this year).
New York needs a starter, and Dempster is a great one. There's no reason why they shouldn't go after him.