states and related ones had been done within quark model in Refs. [@ebert; @roberts; @garcilazo; @migura; @ebert2; @valcarce; @shah; @vijande; @yoshida; @cheng; @cheng2; @chiladze; @chiralquark]. Molecular states had also been used to make predictions in Refs. [@hofmann; @tejero] studying the interaction of coupled channels, one of them the $\Xi^+_c K^-$ where the recent LHCb states were found. A more updated study along these lines was done in Ref. [@romanets], where predictions for charmed and strange baryons are done using an interaction based on $\textrm{SU(6)}$ flavor-spin symmetry in the light quark sector and $\textrm{SU(2)}$ spin symmetry in the heavy quark sector, extending the $\textrm{SU(3)}$ Weinberg-Tomozawa interaction. All these works take the coupled channels of meson-baryon that couple to the desired baryon quantum numbers and use a unitary scheme to obtain the scattering matrix between the channels, looking for poles of this matrix. The differences come from the input interaction and the way that loops are regularized.

The experimental findings of Ref. [@lhcbexp] have brought a new wave of theoretical activity with many suggestions to explain the new states. Different versions of quark models have been proposed in Refs. [@rosner; @qzhao; @weiwang; @xiangliu]. Pentaquark options have been suggested in Refs. [@yang; @huangping; 