He is one of the candidates who is/are willing to debate the issues. (it is 'are' due to the relative pronoun) He is the only one of the candidates who is/are willing to debate the issues. (what should be used here?) I am focusing on "only" here.If we go by 'only' then its a single noun but if we go by the relative pronoun rule then who refers to candidates and that calls for a plural verb. I need to know this strictly in terms of grammar please.
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