Much of the problem here seems to be that we practically never use anything but pronouns in first and second person. There's the additional matter of our having conflated all present tense, indicative conjugations except the third person singular in almost all verbs. In this case it means that we expect a single name, e.g., Ryan, to go with a third person singular verb and it doesn't sound right if we hear it some other way. That this is approximately the same argument that gives us nucular for nuclear may be dismissed by some, but it does fit with Safire's Law, "if it sounds funny, the hell with it." Still, it seems somehow to go against the simple notion that a pronoun is a word used in the place of a noun or noun phrase. To put it in another context, which is correct?

A) It is I who is the House Fool,

or

2) It is I who am the House Fool?