I completely agree with the analysis on why the HR/9 jumped, but it's the three-year decline that bothers me. I don't think we can pin it all on the HR rate, since the total number increased is just 5 from 2005-2006. He gave up an additional 26 R in only 8 more innings last year than in 2005. His FIP jumped by a full run. LOB% declined by 15%, after a 7% drop the year prior - that's the one that scares you. I'm concerned last year doesn't look like an aberration so much as a trend.
Granted, pitching in that bandbox can't be great for your confidence, so maybe that is the solution here. Since the peripherals are still pretty good and it's the actual performance that is hurting, it could be that he is just mentally not there and can't make the pitches he needs to when it counts. I just worry about overpaying (figuratively) for a guy who's maybe in decline, and whose out pitch (slider) is notoriously hard on the arm.
That said, if it's Lidge or Linebrink, I'll take Lidge faster than you can say Giambi's Needle.
Here's the report card on Lidge from a good Astros blog: http://blog.kir.com/archives/003505.asp
Brad Lidge: F Lidge (5.28 ERA/-6 RSAA) was one of the worst pitchers on the Stros pitching staff this season. It's not difficult to understand why -- he simply has lost his ability to throw his devastating slider for strikes consistently. As a result, hitters are laying off Lidge's slider and laying into his fastball, which Lidge does not locate well. Ever since his breakout performance in 2004 (26 RSAA), Lidge has been trending steadily downward (only an 8 RSAA over the past two seasons). The more consistent Wheeler now has a better RSAA than Lidge over the past three seasons and should be the closer going into the 2007 season. Although his trade value has plummeted over the past year, the Stros should definitely listen to reasonable offers for Lidge. It is looking less likely with each passing season that he will ever regain his dominating 2004 level of performance.