Update...I am starting to come around on the idea of Skull Kid. I was trying to understand what it was about his inclusion that bothered me so much.
I did not want a Zelda newcomer that made the overall series representation worse- meaning, did not diversify Hyrule more (other than Impa, a clear and necessary Echo that I 100 percent am expecting).
In part, that is why adding all four champions would be so wonderful- because those four species are four key missing aspects of the world missing, the variation in creature, in ability, in visual! Yet, that was never going to happen.
So... what about Skull Kid Bothered me? In part, it was only associating him with a single game. Which was my mistake. I had forgotten the others. They were not as notable as my most wanted newcomer (below), but it is viable.
I can say, the biggest thing that I did not realize was mentally blocking me, was that I really wanted Vaati. Yet, while I love Vaati more, theres no way he would get in over Skull Kid at this point.
I always thought Vaati was the missing piece of the Zelda representation.
That all said, Skull Kid is a part of the pieces of Hyrule. And I may be completely conflating my Zelda timeline, but if I recall, isnt there a connection between Midna, Majora's Mask, and Vaati? Or at least two of those three. Something I dont recall. Maybe it was never confirmed back in theory talk.
Either way. That is a strong energy that in general needs a presence.