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So I apologize for misinterpreting what you said here. When arborists talk about tree collars and tree wells, we are generally referring to a protective structure that keeps dirt away from the tree base allowing the critical junction where trunk bark transitions to root bark to be maintained...

Sorry, I see nothing definitive in those pictures other than terrible structure and what the hell did they do for $1,100? I can see clusters of blackened leaves that could be fungal or bacterial but because they are predominantly on just one side it still leads me to believe that there is...

If as you say, you have already dug around the base and set a tree well I would be more interested in seeing some close-ups of the limbs and branches where the dead meets live.

An easy and in fact, the most accurate test you can do to determine if you have a water/drainage issue is to dig a hole. A post hole digger is the easiest but a shovel will work just fine. Go 18" to 24" down. What do you see? Is the dirt stagnant and wet or crumbly and dry? Cover the hole...

Don't let whoever did your neighbors trees anywhere near your trees. Too many things that the pictures don't show to make any kind of recommendations. However, when I see two trees with one side more stressed than the other in a small lawn area, a watering problem is not what jumps to my mind...