visual vs. non-visual evidence

While translating Mark 6:14-16 into Enga the translators had to decide on the nature of evidence that is quoted here.

Adam Boyd on his blog) explains: “”When drawing conclusions in Enga, a person has to state whether the evidence for the conclusion is visual or non-visual. So, for example, with King Herod, it is clear that his conclusion that Jesus was John the Baptist was based on non-visual evidence, namely, the reports that he had been hearing. But what about the other people who concluded that Jesus was Elijah or one of the prophets? Were their conclusions based on seeing Jesus in action or were their conclusions based only on reports that they had heard about Jesus. The text of Scripture doesn’t tell us, but in Enga, we are required to answer this question. So we decided that the reports of others were based on visual evidence, assuming that the reports had come, at least initially, from people who had been eye-witnesses of Jesus’ miraculous works.”