You have a good question, but the wrong reason. Should "he is" be replaced by "he would" to agree with "responded"? No.
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Should "he is" be replaced by "he would" to agree with "responded"?No. This sentence has two major clauses, which say that "Jon Doe responded" and "Jon Doe said". They already agree in tense, so no problem there. It might be good to add a comma after Sunday for clarity.
goronskyShould "he is" be replaced by "he would" to agree with "responded"?Not with "coming". That replacement would create "he would coming in".