Is everybody forgetting another use for Zande spears?
I have just read they used them for trading marriages. It seems as the bridgegroom has to give the girls father some ten pieces, within time prior to the comitment.
Perhaps these seven blades were part of a dowry, as the bride fled before the entangling took place
Maybe only the unshafted blades were handed over, in these rituals. That would explain why these specific examples don't show any traces of shafts having been in place ... my fantasy.
fernando