His anxiety issues, his less than stellar August and September. He falls apart in the playoffs. I do not consider him a top 10 pitcher. To make that kind of commitment would be asinine when you have a top three locked in with Strasburg, Gonzalez and Zimmerman. Detwiler is more than a quality fourth starter. Where do you really need to lock in Grienke who is hardly an ace in. Marcum, or even trading for a quality third type starter is more than enough. Just because Grienke is the best starter on the market doesn't mean he's a need. The need is center field and shoring up first base. Whether that's LaRoche, Morse or another option.
Grienke would displace whoever would be our current 5th starter, say Lannan. That's a significant upgrade, you'd have to weigh the cost of those extra wins vs. other improvements you could make. I wouldn't write it off as a plausible way to improve.
