  The spectral two-point function of chaotic quantum graphs is expected to be
universal. Within the supersymmetry approach, a proof of that assertion amounts
to showing that the contribution of non-universal (or massive) modes vanishes
in the limit of infinite graph size. Here we pay particular attention to the
fact that the massive modes are defined in a coset space. Using the assumption
that the spectral gap of the Perron-Frobenius operator remains finite in the
limit, we then argue that the massive modes are indeed negligible.
