To my mind, an option isn't an option if it's known beforehand that it isn't going to work. This was the case with the options you mentioned--- dropping an anchor, deploying a sea anchor, and so on. None of these would have worked in this particular situation, my friend knew it, so he focused on the one thing he could do that might work in the few minutes he had to try something. And, as it turned out, that option didn't work either. But it was the only one that had a chance of working.
science teaches us that one never knows what will happen untill it is tried. U may think u do but the results are seldom as you evision. I have spent a lifetime preforming good science that must stand up to the scrutiny of the scientific community, the courts, and i learned early on never to rule out anything untill it has been tried. The results often surprise you