Apologies, Smithsax - my checking of the forum is sporadic today, and likely to remain that way for the rest of the day. I think 8D must be the grid entry referred to in the preamble, since my path starts in its second cell. The path does not pass through 8D again, instead it zigzags down to the 2nd cell of 28, then meanders round to the left side of the 'arena'. The phrase in the 3rd line of the preamble, "through which solvers must draw a line" I'm sure only applies to the 6,2,7 phrase and not to the grid entry. I think there may be some confusion caused by the wording of the preamble in this section.
The hint to the grid entry must refer to 8D, since it is also referred to in a later clause as the start of the path. I'm not sure whether I've answered your question, but I hope this helps...