Quite a lot can be proven, Cyborg, but proofs only exist in closed functional systems, such as mathematics or logic.
All the intelligent person can do is decide which way the evidence points to.
In any open functional system, that may be true. Religion is an open functional system. There is one exception: science. Science does not use supporting evidence at all, and a theory of science can be falsified by evidence or by a mathematical or logical proof. Yet, science is an open functional system.
There was no Bible in the first century when the accounts were being written.
Yes there was. The Old Testament writings of the prophets existed at the time of Christ. They foretold the coming of Christ, and of his death and resurrection. That was the 'Bible' of the time.
You had different accounts being written in different communities either by eyewitnesses, or by people who knew and interviewed the eyewitnesses.
Not interviews, Cyborg. They wrote it themselves.
You had at least five different independent accounts of Jesus being taken off the cross and buried. There are no alternative accounts contesting this. The tomb and Joseph of Aramethea are attested in all accounts. Being a member of the Sanhedrin, Joseph of Aramethea was a high ranking Jew who could have had some influence with Pontius Pilate and the Roman occupation authority.
Quite right.
Our surviving accounts of Roman crucifixion are fragmentary, and it's difficult to say what would have been 'normal'.
Not that fragmentary. Also, crucifixion was not just a Roman thing. It was practiced by several cultures. In Rome, crucifixion was usually reserved for crimes against the State. Christ, of course, committed no crime, but He was accused of one by claiming He was the Son of God, which the Romans perceived as insurrection, and which the Pharisees perceived as a threat to their power base.
On balance, the manuscript evidence and attestations point to Jesus being taken off the cross by a high ranking Jew who was sympathetic to the Jesus movement, and Jesus being laid out in a rock tomb.
Correct.
Death on the cross is caused primarily by asphyxiation, with blood loss and exposure as secondary factors. Romans would sometimes break the legs of the condemned to hasten the process. In the case of Jesus Christ, his legs were not broken, but a guard did stick a sword in His side after the death. The body was taken down, laid in the tomb, and three days later, He was resurrected and walked out of the tomb.