I have some questions about Stand Arrows ever since part 5 (manga). So it is established that the Stand Arrows were found by Diavolo and 5/6 were sold to Enya who used them to create Stand Arrows under DIO. However, I remember in Part 3 that people like Avdol, Polnareff and Kakyoin all had their Stands since either birth or a young age. So, why is this? Were they shot by either Enya or Passione members? If not, how did they get their Stands? Or did Araki forget again?