We're fresh off the first "official" mock draft of the spring, and that's exactly where Jim Callis, Jonathan Mayo and Jason Ratliff kicked things off on this week's Pipeline Podcast. They broke down what it looks like at the very top, discussing the probability that Roch Cholowsky, the No. 1 prospect in the class, goes No. 1 to the White Sox, before looking at how fluid the first round is after the first handful of picks. After examining Cholowsky's performance in the weekly Roch Watch segment, they turned their attention to pro prospects, starting with ones who have been promoted to the big leagues recently, like the Mets' AJ Ewing. There have been a slew of top prospects moving up levels in the Minors, and the guys give infielders George Lombard Jr. and Arjun Nimmala their flowers before finishing up with a look at MLB.com's first Rookie of the Year poll and how they voted in each league, capping things off with a Mailbag question about Pirates phenom Seth Hernandez.

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