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We analyze the contribution from excitation of the $(q\bar q)(f\bar f),(q\barq)g_1...g_n(f\bar f)$ Fock states of the photon to high mass diffraction inDIS. We show that the large $Q^2$ behavior of this contribution can bedescribed by the DLLA evolution from the non-perturbative $f\bar f$ valencestate of the pomeron. Although of higher order in pQCD, the new contribution tohigh-mass diffraction is comparable to that from the excitation of the $q\bar qg$ Fock state of the photon.Comment: 12 pages, 2 figures, the oublished version. The slight numerical  errors corrected, all conclusions are retaine

Evolution of high-mass diffraction from the light quark valence component of the Pomeron