Kinda hard to show Thomas his scars, you think
John Dominic Crossan, emeritus professor of religious studies at DePaul University in Chicago, agrees with Zias that little is known about Jesus' execution. "Early Christians believed that Jesus was nailed to the cross," he said. "But there is absolutely no proof of this. The only skeleton of a crucified person ever recovered indicated that the two arms were tied to a crossbar, and two nails were used in either shinbone. There was no standard procedure in any of this. The only common feature in the different types of crucifixion is intense sadism."
Crossan is one of the fringe 'theologians' of the Jesus Seminar. There is documented archaeological proof showing the wear on the bones in the wrist that resulted from the nail. How could one tell from bones if the arms were tied? You can't.
If one was tied at the wrists, after hanging for some period of time, vessels could burst, and bones could even break.
Death would come quickly with nails; the Romans designed their form of crucifixion precisely so that death would NOT come quickly.