Fair call. As I said in my third post , I am also of the opinion that the Zulu Empire was phenomenal and worthy of most of the other (far more lauded) 'great empires' in global history. The development of the assegai was, as you rightfully say, a massive leap forward in terms of the military technology of the day in southern Africa. Hell, if Shaka HAD invented the gun, it's quite conceivable most of Africa and large parts of Europe would be speaking Zulu today!

"Compared to guns - yes, the Zulu's weapons were inferior"
And yet, they still managed to inflict a massive defeat on the technologically far superior British Army (albeit at the cost of many Zulu lives)