We could probably get Kenshin Krapakami from Atlanta for a platypus that's been dead for two weeks, although I'd prefer Gavin Floyd or Nick Blackburn.
Look at Kawakami's numbers from both seasons. I'm not sure why he would be moved since only two stats really dropped (BABIP and LOB%) and those would be the cause of the jump in WHIP and ERA respectively:
2009: 32 G, 25 GS, 156.1 IP, 6.04 K/9, 3.28 BB/9, 0.86 HR/9, K/BB 1.84, .284 BABIP, 73.3% LOB, 3.86 ERA, 4.21 FIP, 4.61 xFIP, 1.34 WHIP, 1.7 WAR
2010: 18 G, 16 GS, 87.1 IP, 6.08 K/9, 3.30 BB/9, 1.03 HR/9, K/BB 1.84, .304 BABIP, 63.3% LOB, 5.15 ERA, 4.35 FIP, 4.56 xFIP, 1.49 WHIP, 0.8 WAR
Our current possible SP with better stats last year:
FIP: Strasburg, Gorzelanny, Livan and Stammen.
xFIP: Stras, JZ, Stammen, Gorzelanny, Lannan.
WHIP: Stras, JZ, Livan, Martin, Stammen
K/9: Stras, Gorzelanny, JZ
BB/9: Martin, Stras, Livan, Stammen, JZ, Lannan
K/BB: Stras, Martin, JZ, Stammen
Kawakami would add more solid depth to the rotation. The above just shows how good Stras is, how well JZ pitched despite a bad start or two when he came back, and that Stammen really does deserve a shot to see if he can get through the lineup 3 times consistently.