The Search - conclusion.
Sipike`s son, Chief Mkakwa was in Ubombo at the right time.
He was born in 1843, so would have been 39 years old at the time of the marriage, and could quite conceivably have had a daughter, any age between 16 and 20 years old.
He died on the 5th March 1905 aged 62, so there is no possibility of the person we are looking for to be his son and heir, Nkunzi.
From the information we have, it is almost certain that the Chief at the time of the marriage, and therefore Daphne`s great, great Zulu Grandfather, was Chief Mkakwa.