two witnesses gave an affidavit under oath. without seeing the affidavits, hearing from the witnesses, it's difficult to to gauge how reliable either the testimony or the witnesses are
from the testimony under oath from Botha he backpeddled on many of his initial assertions as to what the witnesses said they saw or heard, and when challenged by defence he had to agree with them that the witness could not say whose voices it was,
and then he could not even be sure how far away one of the witnesses lived
so I think one can speculate about said witnesses from Bothas testimony