More like he's their 4th starter with Strasburg, Gio, and Zimmerman with Detwiler rounding out the rotation. He's basically their Edwin Jackson for this season. If Dan Haren is to the Nats what Edwin Jackson has been to the Rays, then I would expect the Nats rotation to be pretty dominant. Say what? Edwin Jackson was with the Nats last year. He was their one-year signing last year that went out and earned himself a likely multi year deal. Sorry, had the typical brain fart typical of a long, hard day at work.