Final answer:
It is unclear who might have collected the bones in the cave.
Step-by-step explanation:
The question is asking who or what could have collected the bones in the cave if it wasn't A. africanus. Based on the information provided, it is unclear who might have collected the bones. The evidence suggests that H. naledi may have used the cave system as a burial site for their dead. However, there is no direct evidence to determine who collected the bones in this particular cave.