Allow migrate an app between publishers account
This is common issue. The developers might change their country of reside, new countries might be opened in Dev Center, apps can be sold to other owners. How to migrate app to new account without deleting and resubmitting under new one? It will cause losing all reviews and position.
You can open up a support ticket and ask for an app to be moved today. The app will lose all of the reviews associated with it, but it will be moved between publisher accounts and will retain rank/users.