[Acting career] Is getting the same co-stars in every gig normal?

I can't wait, so I use the mod to skip the time until it's gig day. Here is the result.

After passing the audition, the game will pick the crew who will visit the lot when invited. There are...

1. Director
2. two fixed co-star
3. Another actor, who is the same person, even if you reload the game after getting the gig. (This time is Judith Ward)

But when I skip time to the gig day, the co-stars are still the same person. Judith doesn't become the 3rd co-star. She is still a background actress.

So, the result is, you will get the same co-star forever unless you delete them, they die, or you kill...

At least, this is the result in my game.

-----

Now I started to be curious about another thing, if I play with Judith Ward and let her have a gig, will she get the same co-star as my sim got? I will test now!