The Astros trading Roy Oswalt to the Phillies seems to depend on J.A. Happ:

The Phillies know what the Astros want for Oswalt. The question is whether the Phils are willing to follow through on such a deal.

Phillies officials are divided on whether to part with left-hander J.A. Happ and prospects for Oswalt — and take on the approximately $5 million remaining in Oswalt’s salary this season, plus his $16 million salary for 2011 and possibly another $16 million in ’12.

Or they could just try to win with Happ.