So what do you think? Would you like the experienced story-teller to take a shot at Ash & Co. Are you intrigued by it? Do you not like the idea? If you don't like it, please explain your thoughts below?
It really depends on what kind of story he's going to tell. I've only read the first three volumes of Pokémon Adventures extensively to get an idea of what the early adventures were like. It's the run of the mill Shōnen story featuring Pokémon, nothing too special other than a much more action-prone Team Rocket causing a lot of trouble for our heroes. Red, in particular, is pretty much Ash except with a more extensive knowledge of Pokémon (i.e. remembering type advantages, Pokémon species, etc) due to being alone for the most part unlike Ash (if you've seen
Pokémon: I Choose You, you know that Ash's intelligence is highly dependent on whether he has a mentor figure accompanying him or not). Other than that, there is nothing too special about him.
From what I've managed to gather for the future arcs, it seems quite clear every Adventure character after Red seems to have a more complex character and arc. From Ruby's preference for Contests to Sapphire's wild tomboyish nature to Diamond's clown act to Platinum's rich background to Sun's obsession with money to Moon's love of Poison-Types, etc. And apparently, the Pokémon Adventure's popularity didn't really take off until around Yellow/Gold & Silver where the focus went from Red to Yellow/Gold.
Because of this, I thinks it's highly likely that Kusaka would more likely focus on characters that surround Ash's life than Ash himself. Such as the Team Rocket trio. You got an interesting set there. Jessie being this proud, vain woman who came from a poor orphanage due to her mother disappearing in search of Mew. James being a sensitive, charming man who ran away from his rich parents because of a forced engagement with a woman he doesn't like. And Meowth whose very backstory of his talking nature is legendary sad. There's enough material for Kusaka to work off of. And that's not getting into Brock's family issues, Misty's issues as the youngest of four sisters, etc.
If this sounds familiar to you, it's because I'm looking at another writer known to tackle less kid-friendly topics and complex characters in Pokémon: Takeshi Shūdo.
To understand how Kusaka may operate in an anime season to look at Takeshi Shūdo and see what he had to face during his tenure as head writer of the anime series. But that alone may not be enough since manga don't really much room for filler, breather episodes that the anime is known for. Occasionally, there may be a chapter or two that showcases the daily life of Red when he's not fighting Team Rocket. But when the story starts to pick up, they virtually all but disappear. The only time that the anime has ever used that format (aka full storyline with no filler) is the Kalos League/Team Flare arc, and that's mainly due to the fact that they had a year to wrap up the loose ends and thus can't afford to use any episodes slots remaining for filler episodes. Otherwise, you'll have the story arc being stretch out by the occasional filler batch of episodes.
That's not also getting into the fact that a writer is only part of the process in the anime production. The real visionary behind of the anime's direction and tone is the director. For Kusaka to do his best, he has to cooperate with the director very well in order to ensure the best product.