Agreed 90th, a number of those escaping into the river at Fugitives drift were swept away and their bodies never found. Yet others were reported jumping off cliff faces and dieing in the fall. These details are unknown so trying to do a recon on the overall numbers buried at Isandlwana is a bit of a wasted exercise.
Further, some graves/cairns recently reconstructed were found to contain only bone fragments which passed through a 5cm sieve, ie no whole bodies there and no certaintity that all the bones were all human either.
Will we ever know?