Well, the old team created an entire world, all the current gear, weapons, models, lore, blah blah blah.

New team removed active-combat, removed collision detection, removed mob behaviour, oversimplified crafting, etc.

Sorry but removing half the game doesn't qualify you to be on the credits. Credit where credit is due. For now anyway.

When they add enough stuff, then they shall be worthy of being on credit list.