Dipre's right. We did start the season with great depth. Results like this is why you make sure you have that depth if you can.
We've actually had nearly as many problems this year as we had in 2006 at this point. It's having the extra options that's separated this year's result from 2006. You'll notice that we've officially used ALL of those 7-8 starters this year (even if we've only used Bowden and Tazawa in the pen, we've used them). In 2006 we used THIRTEEN different starters.
If we hadn't been this deep, and we'd have guys who failed like Daisuke or Smoltz or simply got hurt like Wake, we'd have to be desperately scanning the waiver wire for anyone's castoff pitchers. We might even have to pick up worthless scrub starters for the #5 role. Just for a random example, we might even have to use guys like Sergio Mitre.