I'm a very careful and demanding researcher, even of myself. I must confess that I was not absolutely confident of such a radical disagreement with tradition until I used the solution to Solve Daniel 9 and the rest of biblical chronology. So I don't blame you for doubts. The Sunday traditon is like Goerbells proverbial repeat a lie often enough that it becomes the truth -- very compelling if you don't have absolute truth to counter it. Anyway, I did the hard work and left the means to verify it. Just follow the links to the chronology book.
Hello 007!
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What appears to have happened, is that the Church fell into apostasy about as speedily as ancient Israel ever did, in which case, God left them vulnerable to otherworldly influences which sought to make the Church anti-law and the Jews anti-Messiah. Neither apostate Christians nor apostate Jews had any interest in a Sabbath resurrection, and they conspired against it, because in a Sabbath resurrection the Torah and the Messiah are united in one argument.
Found at:
SABBATWN in the LXX and NT and related word studies
With your above explanation of why a Sabbath resurrection was lost to history.....I believe you nailed it!