  Latest measurements have revealed that the deviation from a maximal solar
mixing angle is approximately the Cabibbo angle, i.e. QLC relation. We argue
that it is not plausible that this deviation from maximality, be it a
coincidence or not, comes from the charged lepton mixing. Consequently we have
calculated the required corrections to the exactly bimaximal neutrino mass
matrix ansatz necessary to account for the solar mass difference and the solar
mixing angle. We point out that the relative size of these two corrections
depends strongly on the hierarchy case under consideration. We find that the
inverted hierarchy case with opposite CP parities, which is known to guarantee
the RGE stability of the solar mixing angle, offers the most plausible scenario
for a high energy origin of a QLC-corrected bimaximal neutrino mass matrix.
This possibility may allow us to explain the QLC relation in connection with
the origin of the charged fermion mass matrices.
