Blend animations

I was wondering if as a pretty good general rule that everything except for the forward, back and side step animations should be blends. Looking at the orc model it seems only the look, recoil, and head animations are blends.
It seems to make sense but since I am just starting to dive into the animation system I was just looking for some confirmation or exceptions that people may know of.

I tried doing a search but everytime I searched on "blend" the search engine kept saying "No threads were found that matched your query".