I have few ideas, a game at the beginning of the Hero fails timeline before alttp, where you are zelda trying to seal ganondorf. This is very reasonable since is says in HH that the 7 sages, led by zelda sealed ganon. I'd really like to see this game because it would make more sense of the very controversial death timeline.
Another game I think would be interesting is one between majoras mask and twilight princess. They blend together pretty well, but when i started my second playthrough of majora's mask today, At the part where link flashes back and remembers zelda, zelda tells link that she knows that link will be returning to hyrule. I want to see how he gets back and why. And why he becomes the hero shade.
The last game that i've been thinking about is one after four swords explaining what happened to the four sword, where did it go and why does it magically reappear after hundreds of years in four swords adventures? And telling if the four sword/picori blade/ and master sword are one and the same or not.
what do you guys think?