Lyn,
That's a very good question, and I'm not sure that anyone in the world knows the true answer, but I agree with Gloria, and our collective experience has suggested that the form does not matter for many/most of us. For example, it is claimed that all oils are safe, (free of allergens), because the processing is supposed to remove
all proteins. Unfortunately, many of us have found that we react to oils, anyway, (though usually not as severely as we react to the proteins themselves).
Are you quite sure that the soy sauce you are using is 100% free of wheat? It probably is, but I ask, just to be absolutely sure, because this is the Wikipedia description of Tamari:
Tamari (たまり ?)
Produced mainly in the Chūbu region of Japan, tamari is darker in appearance and richer in flavour than koikuchi. It contains little or no wheat; wheat-free tamari is popular among people eating a wheat free diet. It is the "original" Japanese soy sauce, as its recipe is closest to the soy sauce originally introduced to Japan from China. Technically, this variety is known as miso-damari (味噌溜り), as this is the liquid that runs off miso as it matures.
Assuming that part checks out OK, and since I can't seem to locate any specific information on the chemistry of the fermentation process involved in soy sauce, consider this article about fermenting yeast in bread, (note that we react to both certain gliadins, and certain components of glutenin, either together or individually, and we also react to gluten, (in bread), after the two proteins are chemically combined by the addition of water and kneading, which binds the bread together and gives it it's characteristic texture and "elasticity"). IOW, neither the chemical combination of the two protein forms, nor the yeast fermentation process, (nor the baking process, for that matter), changes the allergenicity of the various forms of protein in wheat that we react to.
http://www.baking911.com/bread/101_fermentation.htm
Based on that, I would suspect that if someone reacts to any form of soya protein, she or he will probably react to any forms, at any stage of processing. Obviously, I'm just guessing here, since I don't have access to the actual chemistry involved in all the processes, (and I probably wouldn't understand it, even if I did have access to it).
Have you checked Jean's List of Soy Products/Additives?
http://www.perskyfarms.com/phpBB2/viewtopic.php?t=736
Tex