Bolded a very important part of that sentence.
Well, I do not want to commit to getting up when they do. ;)
Plus in winter here they can spend days on end inside the coop because of nasty weather.
https://www.backyardchickens.com/threads/adding-to-the-flock.1178751/#post-18576900
The 4/10(coop/run) rule of thumb is a bare minimum IMO.
Can depend on your climate, whether you feed/water inside or out, and the demeanor of your birds.
'Only in there at night' does not mean they need less space in coop...they need to go in to lay and get settled on roosts, both can be...
They should be fine, you could always file the very tip off the new birds to even the odds if absolutely necessary(last resort tho)....but integration and pecking order can definitely be something to learn about, manage, and be prepared for.
even with their dubbed beaks, the existing birds will...