Phil Payne has sent me a new version of his response to Head's critique concerning the marginalia in Codex Vaticanus, dated 15 March, which has been extensively edited and rewritten, as he says, "to take into consideration comments received. It includes evidence from the distigmai in the margins of the LXX of Codex Vaticanus and particularly distigmai in the margins of the Hexaplar Codex Colberto-Sarravianus (4th-5th century LXX G) proving that distigmai were in use to mark even more sophisticated textual variants (entailing differences between Hebrew and Greek
texts) at close to the time Codex Vaticanus was written.”
Read it and make your own opinion. The document is now available for download here and in the right sidebar among TC Files (where it has replaced the earlier version).
A wider question to think about: how does a blogdiscussion like this (including uploaded documents) work together with scholarly publishing on the issue. What are the advantages/disadvantages? I don't have the answers, although I realize that the different sides may understand each other better and sharpen their argument accordingly.