Coyotes are alot like humans.
They find a good spot and set up house.
They mark their territory every day to essentially tell other coyotes that this is private property.
If a coyote vacates for whatever reason, another coyote (or coyotes) move in to the better diggs. This is the "fill-in" I think you were eluding to. Arizona happens to be a "fill-in" state from what I can tell. Those fill-in areas happen to occur close to water in southern AZ. Yes, from what I've witnessed, it takes about a week to 10 days for new coyotes to move in to the better habitat areas. I like to think it is all about improving their social status, sorta like buying a bigger house in a better location. Location, Location, Location holds true with humans and coyotes as well.
As far as studies by any Phud, I take them with a grain of salt and dismiss their findings for the most part. Their prose are written with a motive in mind. What we are never sure of is what that motive is. Call me a skeptic if you wish, I can deal with it but it amazes me the impurity of their learned results when applied to those of us who actually hunt the critters they study. It only takes a few minutes of talking or listening to figure out most are full of crap.
I would admit that some coyotes tolerate others, but NOT MANY. There is extreme tension among opposing coyotes no matter how close they socialize in times of drought and poor habitat.
All coyotes have the ability, tools and wherewithall to cause damage. PERIOD. I don't see a Mother Teresa in any of them. They are wild creatures and certainly hold no benevolent characteristics in my line of thinking.
Dangit! I forgot what the original question was.