So, I recently read that the entire Digimon franchise was created by Akiyoshi Hongo.
(Before I had a series of paragraphs up here describing one of my uncommon interests in detail but I'll shorten it since even with this being a friendlier community and me not being likely to get bullied for it here, you're likely not interested)
One of my biggest and most uncommon interests is pretty big in Digimon Adventure (the type of villain defeat all eight of its main villains get) which makes me think Akiyoshi might have an interest in it (such a high frequency is impressive for both anime and what many have called a "kids show"). And to an extent, in Tamers and Fusion as well (though for the latter, not so much in the first season because revival, and for Tamers, all main villains survive in Japanese, though the dub changes D-Reaper's fate to the same as Apocalymon, Myotismon, Lucemon, Kurata, and Lord Bagra). Frontier is a matter of interpretation to the Digiegg mechanic; Adventure 02 and especially Data Squad had this comparatively low (for Data Squad, three may be high by Pokemon standards but it's low by Digimon standards), and Tri is the polar opposite of Adventure 01 by reviving all the dead villains and re-killing none but MetalSeadramon and Machinedramon, plus its choice of "villain" in contrast to all the others. But Adventure 2020 returns to the style I adore.
So, not sure whether he has this interest or not (Adventure, 2020, parts of Tamers, and Season 2 of Fusion would suggest so, given its rarity in animes (especially modern day animes in Fusion and 2020's case) but Tri would suggest otherwise) - or whether all this is up to the individual writers of the episodes.
Now we get to the issue of Adventure 02. A major problem with this season and its inconsistencies is the writers not collaborating well. For instance, they never clearly explained the presence of Devimon in the Dark Whirlpool. Is it his ghost haunting the ocean or is that spot where he (and other evil Digimon) spends his afterlife until he becomes part of Kimeramon and is re-killed? They also aborted the Dragomon arc after one episode. And they alluded to a game that directly contradicts a.) Machinedramon's definitive death, b.) Ken creating Kimeramon, and c.) Myotismon's status between The Battle for Earth and Oikawa's Shame.
Furthermore, aside from my theory that the "sometimes you have to kill the enemy to save innocent lives" episode was one writer's response to another writer who wrote the Golemon episode, one thing that really bugged me the last time I saw it is that they seemed to completely forget that the Digidestined's parents knew all about Digimon from the Myotismon arc. Until one episode where Izzy's mother mentions Tentomon. Again, as if those episodes were entirely planned out by different people. I know each episode has its own writer and that leads me to my point.
So, the big question I'm leading to is, does Akiyoshi Hongo decide the whole story and how the main thing ends, including fates of the villains? Or does he give a general idea for a story and other writers write it and decide the key points? And how much do the other writers decide, little details like for the script and stuff, or bigger details like how the battle goes down and how it ends? Or does he just design the characters and tell the episode writers to decide what to do with them?
I don't know whether the creator of the series or the individual writers of the episodes decide this stuff.