Dear Joel,
I read your essay, and would like to give you the following constructive feedback:
You advocate the use of octonion algebra to describe fundamental aspects of physics, but for someone who is not already familiar with it, it would be very difficult to discern just from reading your essay what octonion algebra even is, let alone judge the merits of your advocacy.
Also, it seems that the way you associate aspects of octonion algebra to possible properties of spacetime or of particles seems to presuppose very large conceptual jumps to get to the latter from the former.
I think it would have helped your contribution if you had spent some of the unused page allotments explaining the basics of octonion algebra, and given a fuller account of the connections that you see between it and fundamental physics. I know from personal experience that when one thinks about a particular subject matter a lot, one begins to subconsciously expect that others would be able to follow easily one's thought processes, but just remember, octonion algebra would probably be considered as of now a rather obscure field, so there would be very few people who'd have invested as much time into thinking about these possible connections as you have, and as a result most would not be able to follow your lines of reasoning.
A couple of sentences in your essay stood out in my mind:
"Hamilton's discovery of quaternion algebra revolutionized Newtonian physics."
Unless you can provide some evidence to support this claim, I think most mainstream physicists would probably disagree with it. At least I learned Hamilton's principle, the Hamiltonian approach and the Lagrangian approach without any mention of quaternion algebra, but I admit that I do not know to what extent quaternion algebra influenced the discovery of these reformulations (this is the sort of evidence I was talking about).
"Are we missing interesting theories because we are committed to particular
mathematical frameworks, or suitable ones have not been developed ?"
I take this to be a rhetorical questions with an implied affirmative answer. If so, I completely agree, although my view of this issue goes beyond the possible usefulness of octonion (or other) algebras, to include a reconsideration of the entire foundations of mathematics. At this point, classical logic lies at its heart, but I believe that it does not have a sufficient expressive power to express certain kinds of distinctions (e.g. between actuality and potentiality) without which it will be impossible to understand what quantum theory is really telling us about reality. My entry to this contest paints a picture of how the incorporation of some extensions of classical logic can lead to novel mathematical frameworks which in my view help make sense out of some highly counterintuitive aspects of the theory.
So, to summarize, while you contribution had in my view room for two sorts of improvement, I do agree with the basic message, and I think that your essay does not deserve to be at the very bottom of the lot.
Best wishes,
Armin