Cutler says he knows of some of those cases at dmpsbackfire.com and many more like them.
I hear you about chelating while Amalgam is still present, but it has been done and many more are doing it with cilantro and ALA in supplements without knowing it. The ones who actually have and Hg problem are getting hurt by it.
A close friend is one. She lost 6 months of nice gains from Amalgam removal and frequent dose chelaton in a week of inappropriate ALA use (mfgr added it to new version of her multi vitamin).