I want to know the answer to the following question:
What did McKerrow concede about his new copy-text method?
All the background I'm provided with is that "But, fearing the arbitrary exercise of editorial judgment, McKerrow stated that, having concluded that a later edition had substantive revisions attributable to the author, "we must accept all the alterations of that edition, saving any which seem obvious blunders or misprints."". Is that enough to answer the question?