This dawned on me... Eggs are bad for so many due to the linkage to reptiles meaning that the aversion to eggs is a sign that those who experience immediate adverse effects are repelled because of their FRV orientation. This might mean that the swiftness of the adverse effects are an indicator of how strongly you are opposed to the reptilian ie. STS orientation.One possibility is that eggs and grains are potential young, i.e. not yet being born, while piglets, veal, lamb, etc. have actually been born.
The other part of the C's response, "with linkages to reptiles", could be generalized as linkages to beings at lower levels in terms of information, intelligence, etc. Birds are probably considered lower-level beings than mammals. The same goes for grains, which are grasses, and may be consider lower level than tubers.
When the C's said the rules are based independently, they meant based upon the individual person and not based up the individual animal. Originally I took it to mean the rules were based upon the types of animals separately.
So I think this indicates that the adverse reactions one experiences with each type of animal is an indication of how their innate genetic makeup is aligned with the receptors inherent in each type of animal.
Perhaps a kind of gauge as to where each individual stands on the learning cycle.