Well, what word are you referring to?
The word "Messiah," as the ancient world of the Bible understood it.
No early Christian spread the word of any resurrection . These words come from Titus flavious and his scholars / historians. The early Christians speak of a yeshua of Nazarene but none of the things in the four gospels that became law under the council In 382 ad. So history and the Jews do not agree at all with that outlook.
I submit that Paul did--although technically I think you are right, because he never saw himself as a Christian but as a Jew called forth by God.
There were some existing Jewish ideas that were used to interpret Jesus's continuing Power and Presence after his death, and the biblical writers used and re-interpreted them freely.
Elisha and Elijah were "taken up." Other figures were elevated to "God's right hand." The "bones" of Israel rose from the grave, reassembled themselves and the dead was suddenly living as told in Ezekiel. And Paul preached about being caught up in the air into the "third heaven."
My point is that there were a lot of handy cultural metaphors lying around to help the Jews and those who followed Jesus make sense of their tradition. And to deal with Jesus's ignoble suffering and death.