I don't like this modern use of the word "ownership" and cognate expressions.

Many here are assuming that the fact (if it is a fact) that some aspects of border morris adopted some aspects of minstrelsy (which is not compatible with John KirkPatrick having invented border morris) demonstrates that all blackface morris is tainted by the racism inherent in minstrelsy.

That is a non-sequitur.

And if Anglian molly was already "degenerate" when Sharp dismissed it then the fact (if it be correct) that minstrelsy started in about 1860 does not mean that minstrelsy predated blacking up in Anglian molly.