  The discovery of the $X(3872)$ meant the revival of the heavy meson
spectroscopy beyond naive $q\bar q$ structures. Once that the $SU(3)$ scheme,
which was very useful in the dawn of the quark models, does not work for these
states, one has to use new symmetries, like Heavy Quark Spin Symmetry (HQSS)
and Heavy Flavor Symmetry (HFS), to look for new states. However, at the energy
regions where these new states appear, new factors are involved and it is not
straightforward to relate the predictions of the symmetries with the data. In
this work, we present a critical analysis of this problem and show, in a
coupled-channels model, how the relative position of the bare $Q\bar Q$ states
with respect to meson-meson thresholds and the coupling with other channels
modulate the strength of the interaction and, hence, modify the structure of
the predicted states. We found a possible candidate to the $X(3872)$ partner at
$10599$ MeV$/c^2$.
