[neves]

No, it can be great.

The Inca had no money: http://www.discover-peru.org/inca-economy-society/ but they had to distribute goods for all the members of society. The knots were probably central to their organization.

If they find older records, it would also corroborate the claims that more Incas died from the diseases bought from the Spaniards, than by violence during the invasion.