Normally I speak out against the evils of looking at Spring Training performances. It's been proven time and again that they just don't correlate with how a player does during the regular season. Yet, there is one time when it's perfectly acceptable to me to use Spring Training statistics to make a decision: When you have no idea what to use.
When you have several guys with a mish-mash of experience, fighting over one spot, why not just use the Spring Training stats? There is no clear-cut favorite between Detwiler, Maya, and Gorzelanny (forget about Wang for now... in fact I'd forget about Wang period since he was always a pitcher who was skating on the edge because he put so many balls in play. Now he's the same thing, except 31 years old and coming back from a 2-year injury). The stats, in my mind, don't really favor anyone. Ideally we'd expect the team's coaches are looking at a guy's delivery and stuff and making a decision based on improvements and minute changes that we don't see reading box scores from hundreds of miles away. Maybe this is happening. In reality though, the guys that are doing great in Spring Training are, duh, almost certainly going to look the best, and coaches can't help but be influenced by these things.
Livan, Marquis, Lannan, ZNN should be set in stone, regardless of how well they fare in Spring. For that last spot though, it can be a battle of who pitches best in March. It'll probably work out just as well, and it's a lot more fun than who's delivery looks the strongest.