Hi Trish and Flynn and welcome to the forum.
Well, he does have some mish mash results. My dog too has contrary results with the cushings testing and it's a very hard disease to diagnose. If Flynn Is suppressing fine on the LDDS then that isn't consistent with cushings. I've had two LDDS test on my dog in the last two years because some results seem to show cushings but she always suppresses on the LDDS. I'm thinking there could be other things going on with Flynn. Liver, Kidney, or something else. Hopefully the latest tests will give you some answers. It's very scary not knowing.
The good thing is that this forum has a lot of people with experience dealing with many of these items. At least you'll have others to bounce ideas off of who have been on the roller coaster too.
Don't hesitate to ask anything. Flynn has sure been through a lot already. He looks so happy in his picture.
Sharlene and Molly Muffin