C. E. Hill
https://larryhurtado.wordpress.com/2016/06/22/a-challenge-to-the-dating-of-p75/
An early date for P75 just rules out a fourth-century recension, it wouldn’t rule out a recension altogether. The real problem for the idea of a highly edited recension, as I understand it, has little to do with dating of the manuscript. It is that most experts who have examined the text of B and/or P75 (including Westcott and Hort, Fee, Birdsall, Wasserman, Haines-Eitzen, and others) have opined that i
t doesn’t look like an edited or evolved text. That is, it contains relatively few harmonizations, conflations, paraphrases, “corrections” of grammar, vocabulary, style, etc. and therefore looks very “primitive” in comparison with other texts. If it is the result of a “recension,” the recension was done by using excellent, early texts.