I'm never surprised when it comes to the draft. Scouts loved that he has a "loose" arm, which means he has an easy delivery without much strain. Guys like that are more durable and can actually increase their velocity in time.
Callis told me that Marze could go between the 8th-12th round, but that he probably hadn't shown enough now to get big bucks as a draft-eligible sophomore. That's likely why he has dropped. Still needs to improve his secondary stuff.
With a big junior year, you're looking at a guy that could go really early in the 2011 draft and still have plenty of signing leverage as a redshirt junior.