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>.
under the constraints imposed by VT, John is not available as a referent for he in C6 in the rhetorical version, although J o h n is clearly the appropriate antecedent.