Must all results be commented on in the discussion section of a research paper?
Not only is that OK, that's really what you should be doing. Nobody else is going to spend a lot of time going over your data to find interesting conclusions – that's your job. Busy researchers who are related but not directly in your field are likely to only read your abstract, introduction, and discussion.

Your discussion tells us what was interesting and why. If someone really wants to get the whole story then they'll go look at your results section to see for themselves.