[yummyfajitas]

Making a CS person versatile with hadoop is not that hard. Making a CS person versatile with statistics is much harder.

See Zed Shaw's seminal article "Programmers Need To Learn Statistics Or I Will Kill Them All".

http://www.zedshaw.com/essays/programmer_stats.html

Making a math/science person versatile in CS is somewhat easier, but even that can be tricky. Many of them are bored by file formats, architecture, etc, and simply don't have the mindset of of engineering.