In Indirect questions^x, Pronouns^x

With "to be" there won't be an object, so yes, I agree that there won't be a case of "who?" + "to be" where "who" functions as the object. But change "object" to "predicate complement" and you will find cases where "who" functions as predicate complement. To borrow from the thread...

I agree with Lib--when the subject of your sentence is actually the interrogative pronoun, you don't change the word order. For example: "What does it mean?" "What does it mean?" is the direct question, "Do you know what it means?" is the indirect question. You invert the word order because...