  The effective strange quark and antiquark masses are estimated from the
chiral soliton approach (CSA) results for the spectrum of exotic and nonexotic
baryons. There are problems when one tries to project results of the CSA on the
simple quark models (QM): the parameter in $1/N_c$ expansion is so large for
the case of the baryon spectrum that extrapolation to the real $N_c=3$ world is
not possible; rigid (as well soft) rotator model and the bound state model
coincide in the first two orders in $1/N_c$, but differ in the next orders.
There is correspondence of the CSA and simple QM predictions for pentaquarks
(PQ) spectra in negative $S$ sector of the $\{27\}$ and $\{35\}$-plets: the
effective mass of strange quark is about $135 -130\,MeV$, slightly smaller for
$\{35\}$. For positive strangeness components the link between CSA and QM
requires strong dependence of the effective $\bar{s}$ mass on particular SU(3)
multiplet. The SU(3) configuration mixing is important, it pushes the spectrum
towards the simplistic model (with equal masses of the strange quark and
antiquark), and explanation of this nice property is lacking still. The success
of the CSA in describing many properties of baryons and light nuclei
(hypernuclei) means that predictions of pentaquark states should be considered
seriously. Existence of PQ by itself is without any doubt, although very narrow
PQ may not exist. Wide, even very wide PQ should exist, therefore, searches for
PQ remain to be an actual task.
