I think you missed the point of my post. We have all 12 forward spots filled; I just used my preferred lineup. It's fun to know you'd get triggered that you missed the point completely.
Anyhow, if Strome is 1C and he plans on "sneaking in" some shifts with Zegras, then doesn't that mean Strome is playing wing? It's already established that Zegras is a centerman for us. Does that also imply Strome is playing solely wing? I don't know. You don't know either.
This year is a developmental season. I'd prefer to start McTavish at center to continue his development at center, especially since Getz retired. Signing Strome for 5 years was necessary to lock him down for Verbeek. Will he play center or will he play wing? That's unknown.
As for who plays 4C, I don't think it really matters. While I prefer Grant, Eakins' lineup often had Carrick centering Grant.