What happened to this character creating this phenomenom? So, in part 3, we see that Old Joseph tells his grandson, Jotaro Kujo (our protagonist), that

 stands were created by DIO's reawakening.

But in part 4, we see that

 Koichi gets struck by a stand arrow, giving him the stand called Echoes.

These objects were created by

 a meteorite that struck earth https://jojo.fandom.com/wiki/Bow_and_Arrow

This caused

 stand arrows to appear, that were given to a young Diavolo

So did they both influence stands, or was it just one of them?
(spoilers for DIO's Diary, Vento Aureo, Phantom Blood, and StarDust Crusaders)
Joseph never said that the stands were created or summoned directly through DIO's awakening, however he did say that ONLY the Joestar bloodline's stands stemmed from him, as he is indirectly a part of it by stealing Jonathan's body, in DIO's Diary: OverHeaven, he explains that when he awakened from his 100 year sleep, he met Enya, who shot him with the arrow, thus giving him, Joseph, Jotaro, and Holly stands. Everything that was said in Vento Aureo and Diamond is Unbreakable, is true, and stands never stemmed directly from DIO or Jonathan.