The only thing I don’t want is for his old party to be completely dependent on him. In these kinds of stories, the old party is useless without the protagonist, and he practically only shows up to deliver the finishing blow. It needs to be more balanced, with the protagonist gradually surpassing his old party. The problem with these stories is that, in just a few chapters, the protagonist becomes overpowered, gathers a bunch of girls for his party who are useless and only there to idolize him. The story needs to distribute her screen time well.
It’s pretty obvious who to root for, right?