I'm sorry but shudo's take wasn't interesting. Especially the dumb stuff he had about how Pokemon came into the world, and especially the dumb ending he had planned. And all the other angst stuff relating to Ash's dad wasn't really interesting at all.
Like anyone else, Shudo had a mix of good & bad ideas. I like his idea that Pokémon were suddenly appearing as the world changed, that they still needed to be researched. That would've allowed them to add more Pokémon without having to retcon stuff; they even could've had ancient legendary Pokémon, since he mentioned that Pokémon may have appeared in the past & inspired various legends. (Going by memory/my understanding of a fan translation.)
The extra details, like Ash's dad running off to be a trainer, Deliah running a cafe, & Pikachu refusing to be nicknamed, are nice to know about, but not really important in the long run, nor are they worth much development. (My opinion.)
The end...he had two. In one, Ash was an old man, thinking about his journeys with Pokémon. He goes to sleep & wakes up as a kid in the real world, to try to find his place in it & to try to understand everyone around him. Not bad, except it could imply the whole journey was a dream, or that Ash died & was reincarnated in this world. Probably would've made for interesting fan debates.
The other end, where Ash & Pikachu end up on different sides of a war for Pokémon independence, was from around 1999/2000, when they were working on the 4th movie. (My understanding.) I take it Shudo was just sick of the series by that point & he came up with something that would tick off the higher ups.