So, whether you have gallstones or a malfunctioning gallbladder, the treatment of choice is to remove the doggone thing.
Seems to me it's something of a waste of time to go through all that testing just to prove it's dyskinesia, if all the symptoms point to a bad gallbladder, whether "bad" refers to stones or it not emptying properly.
I suppose a doctor has to be certain that's what he's dealing with, but gallstones are a form of dyskinesia as well, since that word means "poor function." If a person has gallstones, his gallbladder is not functioning properly. But, the diagnosis has to be accurate.