Pesachim 22: Do You Have Any... Filet Mignon?

On R. Abahu's position that every prohibition against eating that is in the Torah carries with it a prohibition against getting benefit from that same food. How does this pan with out with the Gid HaNasheh (the sciatic nerve)? Moreover, does the gid ha-neshesh contribute to the flavor of the food? Also, what about the prohibition against non-Jews eating from the limb of a live animal. Note the introduction of the extension of responsibility to protect another from transgression. Plus: The significance (or lack thereof) of the Hebrew word "et."