The April 10th, 2013 edition of daily news for the Los Angeles Angels including Richards to replace Weaver in rotation, Halos not considering trades and much more...
The Monkey Says: Richards is the right choice. 4-to-6 weeks is the perfect little audition for him to show whether or not he can really hack it as a starter. He has been throwing the ball very well this year, so he has a real shot at being a real asset. If he fails, the Angels can shift him back to the bullpen, probably for good. Trading for someone like Harang or Capuano would be questionable since they'd have to be shifted back into the bullpen once Weaver got healthy, thus making them not worth giving up much for.
The Monkey Says: The claim is basically that they are forfeiting about one win worth of value with him out. That makes sense mathematically, but it feels like his loss costs the Halos much more since Weaver represented the best of a bad rotation. Aces like Weaver are often counted on to come in and stop losing streaks or prevent them, so they don't really have that now which may or may not be a big deal depending on how they play without him.