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I think you might have mixed up some words (and since english isn't my native language, the following might not be 100% correct):

A quaternion always has 4 values. Since your "pose" has 3, it either is the position in xyz and you dereferenced the values wrong. Or it is the orientation in euler values, most likely in r(oll) p(itch) y(aw), which basicly is the value you are looking for in radians.

As I said, at this point I am not to certain if "pose" is either another word for "orientation" or for "position". But those values are definetly not a quaternion.