The Chiefs are in need of both safety depth and an inside linebacker (to replace Jovan Belcher this offseason). Rather than wasting a draft pick on both positions, or signing expensive free agents, they could fill the void partially from within.
Start with Brandon Siler, who is a capable two-down linebacker. Siler is weak in coverage but strong against the run and not very expensive.
Next consider the way the NFL is going. Teams are playing out of their nickel package more and more as spread offenses become more common. In situations like these, Siler is a major liability.
Eric Berry is also inconsistent as a cover safety but great against the run. Berry does possess good cover skills for the linebacker position, though.
If the Chiefs were to move Berry down to inside linebacker on passing downs, they would eliminate their need for a starting linebacker. They would need another safety to cover on those downs, but this was already a need.
It could be easily filled by drafting a safety (Eric Reid of LSU, Matt Elam of Florida or someone like TJ McDonald from USC later in the draft) or by signing a veteran safety like Nate Clements from the Bengals.