I like Buchholz a lot, but there are a couple reasons I didn't include him in that post.
1. Liriano and Weaver were picked more recently, and I mentioned them primarily because I was planning on using my most recent pick to select one of them.
2. While Buchholz was great last year, some of his peripherals suggest a regression might be in order for this year, and that same evidence doesn't exist for Weaver and Liriano (in fact, Liriano was extremely unlucky in 2010, and his numbers will likely improve in 2011). Some of these peripherals are...
3.61 FIP
4.20 xFIP
.265 BABIP
79% LOB
Posters in other threads have outlined areas in which Buchholz can be expected to improve in 2011 to help offset the expected normalization of these peripherals, and those ideas certainly have some merit. But for 2011, I don't put him in the same class as Liriano and Weaver.