Your reasoning is logical so far, but allow me sum up your post.
According to you, the Sanhedrin, the Roman guards, political leaders, the mother of Jesus, his disciples, and five hundred witnesses all believe that it was Jesus that died on the cross.
Of course, there are not all solitary reports. You are not quoting hundreds of reports at all. In reality, you are quoting four sources: the four Gospels.
I've presented one source that contradicts your reports, which is the Apocalypse of Peter. Why do you accept the four Gospels as divinely inspired and reject the Apocalypse of Peter?