Actually, that's not true at all. At the beginning of the season, we went with:
Beckett
Lester
Buchholz
Lackey
DiceK
Aceves
Wakefield
Doubront
Miller
Weiland
Millwood (FA Signing)
If Jenks, Dennys Reyes, Okajima, Rich Hill, and Tommy Hottovy didn't all suck so bad/get hurt (Hill), then Aceves would be a SP right now. But our bullpen sucks without Aceves there, so he stopped being an option.
So now look at that rotation. Over the past 13 games, let's look at each player:
Beckett (injured)
Lester
Buchholz (injured)
Lackey (ineffective)
DiceK (injured)
Bedard (injured)
Aceves (bullpen)
Wakefield (ineffectve)
Doubront (bullpen)
Miller (ineffective)
Weiland (ineffective)
Millwood (released)
So it's not like Theo didn't give us depth. He gave the team plenty of depth, but the fliers he took didn't work.
Again. Look at the Rays #7 starter. He's started 4 games and has a 7.98 ERA. Show me one team that has a #8, #9, and #10 starter who are effective. You can't, and do you know why? Because if they are effective starters, they will be #4's and #5's for a team and playing at the MLB level.