So you are trying to say that the stones released from flushing are a combination of SOAP STONES ( formed overnight in intestines) and genuin gallstones.
The SOAP stones will dissolve as per Steve's experiment, while genuin Gallstones wont.
Only subsequent ultrasound tests can prove if the person was successfull in passing any genuin stones OR were these all soap stones afterall.
AND if these are SOAP STONES, why are people doing this awful procedure on a regular basis and rejoicing over their stones. Their bodies just created these stones, as you said.