I don't think Tristram's message was deleted. His later post suggests it was a blank message in error.
I'm not absolutely sure what the answer to the riddle is, since part of it seems mathematically impossible unless one posits an unrealistic answer that is inconsistent with the grid. I'm assuming that the answer is the larger of two possibilities displayed in the grid (depending on the choice for the ambiguous entry).
s_pugh, I assume the grid to be submitted represents the solution, though I'm not 100% certain. The consistent nature of the clashes do not seem to be thematically relevant. Perhaps the clashes are there to make the grid possible at all, and their consistent nature is merely to make things a bit easier for the solver.