Whether he was Tlingit, Champagne and Aishihik, or some combination of both.

The specific community he came from.

The specific purpose of his journey.

Whether he traveled alone or with others.

Whether he was a trader, a messenger, a hunter, a traveler visiting family, or something else entirely.

Whether his death was sudden or prolonged.

Whether anyone knew he was in the mountains when he died.

These unknowns are not failures of the science.