"When Jesus was resurrected, there were witnesses."
Because there needed to be otherwise Christian would have died at that point and there would be no reason to grow. The resurrection was a reason for the faith.
"When the anointed are resurrected, everyone will know because there will be witnesses. "
Where do you get that from?
When Jesus was resurrected, he was a spirit but took on bodies for a reason. To teach and encourage the apostle. But when the anointed are resurrected to heaven as spirit beings, they don't need to do any of that. The kingdom is already established, and Jesus is already king. They have nothing to prove to the people on earth.