  We consider the recently suggested model for some resonances near the open
charm threshold as bound states of charmonium inside excited light mesons. It
is argued in the soft-wall holographic model of QCD that such states of heavy
quarkonium necessarily exist at sufficiently large spin of the light meson. The
bound state is provided by the dilaton exchange through the 5D bulk. We also
argue that the decay of such bound systems into mesons with open heavy flavors
due to splitting of the heavy quarkonium can be treated as semiclassical
tunneling and is suppressed. This behavior is in agreement with the known
relative suppression of the decay of the discussed charmonium-like resonances
into channels with D mesons.
