I return to a set of Tzara essays and Picabia manifestos when thinking about who belongs in Dada. I've done readings. They're all on YouTube. Most notable is Tzara's lecture on Dadaism.
I would also cite the Berlin Dada manifesto, by Richard Huelsenbeck, and then laugh at the assertion that anyone does or does not belong in Dadaism.
You can't gatekeep Nothing
(beware of words with capital letters)