Hullin 28: Making the Best of an Imprecise Mechanism

On the bird's "one siman" being severed, does it make a difference which of the esophagus or the trachea is cut? It's a machloket, whether "either one" is enough or one specific one needs to be cut. The Gemara provides a mnemonic to support 5 different arguments, half of which support the one view above and the other half the other view. Plus, the order of when the simanim themselves are examined in the context of shechitah, and then the order of cutting. Also, what if one of the simanim were cut to be 50/50 cut/not cut -- does that count as the majority being cut or not at all cut? But how can anyone be certain, to that degree of precision?