Both actors are supposed to be regular recurring characters at practically the exact same time, and Stein's character description says that he's going to be actively seeking to find a way to separate himself from Ronnie.
Trying to have both characters appear while they're fused into a single entity seems like it's going to be way too confusing and convoluted.
I don't see why. It's always worked fine in the comics.
Hey, here's an idea. Why don't you wait and see how it plays out before declaring it a disaster?

Pffft... Where do you think we are right now? Some sort of colony of rational human beings?![]()
Stein's character description specifically mentions him searching for a way to facilitate a separation from Ronnie, and with both Victor and Robbie scheduled to have significant recurring roles, there are logistical issues that you're not going to have in a comic book and which, at first blush, seem as if they're going to make things confusing and convoluted, particularly since Victor isn't scheduled to make his first appearance until Episode 12 whereas Robbie will be making his first appearance in Episode 3.

By the time Stein appears, Ronnie will have appeared for 9 episodes, and it would be confusing and convoluted to suddenly have him appearing only as a 'hallucination' once Stein shows up.
Trying to have both characters appear while they're fused into a single entity seems like it's going to be way too confusing and convoluted.