I don't quite follow the "Shields is a career 3-4" narrative. BR says the guy was a 5.3 win pitcher back in 2007 and Fangraphs had him at 4+ WAR in both '07 and '08. Yes, he was poor in 2010, but if you look beyond the ERA, he still struck out 8.28 per 9 and walked only 2.26 - high BABIP, poor LOB%. That year was an exception to the norm, I think. In the grand scheme, since 2007, his total fWAR over that span is comparable to Cole Hamels, Matt Cain, Adam Wainwright, and Roy Oswalt. I'm not necessarily saying he's that good, but he's certainly been better than a number 3 or number 4. At worst, he's a quality #2. I'd give up Turner, I'm just not sure what more it would take.