Did you even read my post?How stupid do you think the writers are? Or even the anime producers?
All of the starters have shown up in more episodes than a Rival has ever had.
If you honestly think that it is a good business plan to piss on one of the starters in terms of marketing you are seriously fooling yourself in a bad way.
No rival has ever shown up in every episode to show off his/her starter, and even then a rival isn't going to show up conveniently when they want to show off that other starter.
There is a freaking reason why all the starters have been on the main cast SINCE generation one. It's a pretty obvious reason. And they aren't suddenly going to screw over a starter now.
If you can't see that I'm sorry.
But the very fact that they are starters is enough fact that they will be at least spread among the main cast, if not given all to Ash.
I have no idea why you honestly think there's even a remote chance that they would make a poor business decision and make it so one starter is only seen once every 10-15 episodes.