If we compute the vein expressions for both representations, we see that the vein for segment C6 in the intentional representation is <A6 B6 C6>, whereas in the rhetorical representation, the vein is <(B6), C6>.
pronouns have very poor evoking power, and therefore a message emitter employs them only when s/he is certain that the structure of the discourse allows for easy recuperation of the antecedent in the message receiver's memory.