How can you drop someone with a 6:1 K/BB?
Who cares if his era is a bit over 4... he's pitching great.
I guess you and I share different opinions on what pitching great is.
Yes he has a great k/BB ratio, but that just one measure of a pitchers worth. I kinda view it like this: yeah, he's not walking anyone, but nor is throwing off the heart of the plate. He's giving up almost 1.25 hits/IP which is certainly not good. He's lasted less than 6 innings in half of his starts to date. His BAA is .300 and, as Jags has already pointed out, he's giving up more long balls then in teh past.
All that combind with a crappy offensive team is making him less and less appealing. Maybe I could be more patient if he was on the Cards or something, but I'm not seeing too much upside at this point.