That would be such a shame if he did. It's one of the reasons which makes the story just great.
As you said, there are so many now he should be starting to clear things up and not just forget. Look at us debating here about them. Just one of the things that keeps the wait for the next episode just a little more enduring and some nice and heated discussions.
By now it's hard to set a line between the important and secondary issues since they could be intertwined. Well according to Dalli at least
At this point a little, seemable non existing secondary issue can have a huge impact on an ongoing important one.