I would just like to make sure you understand...
This triangle is just sloping from the rest of the concrete, and has not actually dropped any at the attachment of the rest of the slab.
It sloped 1 inch before he worked on it, but now without watering, it is sloping 6/8 inch or so.
It seems very hard that I would have to replace a piece of the floor.
If the whole triangle part just dropped down even at the slab attachment, then yes, I could see that, but it hasn't.
Seems it could be just swung up from the corner with some more jacking and the like you said with some foam and concrete for additional support.
If I water now and it lifts up a little , the foundation guys won't be able to see the full extent of the slope.
Should I water and see how much it comes up.
Before the guy worked on it, I watered and it rose at least 1/2 inch.