Look, don't misunderstand. I agree that Ogando is our best option AT THIS POINT. I just don't think he is the long term answer to many questions.
As for Feldy, well, he is just Feldy. Not horrible, but hardly someone you build a rotation around.
As for Roy O., I'd only sign him if it were not my money (which it isn't). We've had some good pickups over the recent years, and some real bad ones. Heck, we took a lark on Harden and Webb. If nothing else, Roy O. is a better bet than they were.
In short, putting aside whether we should sign Roy O., I'm a little concerned (okay, a little more than a little) about the long term stability of our current rotation. At least insofar as getting to the World Series again is concerned.