You bring up a good point, but it seems as if Watson was designed with this in mind. If you notice in the JSON response, it lists this query as a factoid class.

It may handle different queries with different attributes differently, such as focusing on certain portions of its corpus or changing what aspects of its search results are more heavily weighed.

A query identified as a factoid might be researched and judged very differently than something a bit more nebulous, such as a comparison, or something with more specificity like the examples you listed.

Admittedly, I am basing quite a bit off of one example response given in their documentation, but it is an intriguing clue as to how Watson will handle that aspect of understanding which info to discern.