  One type of dynamical generation consists in the formation of multiple
hadronic resonances from single seed states by incorporating hadronic loop
contributions on the level of $s$-wave propagators. Along this line, we study
the propagator poles within two models of scalar resonances and report on the
status of our work: (i) Using a simple quantum field theory describing the
decay of $f_{0}(500)$ into two pions, we may obtain a second, additional pole
on the first Riemann sheet below the pion-pion threshold (i.e., a stable state
can emerge). (ii) We perform a numerical study of the pole(s) of $a_{0}(1450)$
by using as an input the results obtained in the extended Linear Sigma Model
(eLSM). Here, we do not find any additional pole besides the original one, thus
we cannot obtain $a_{0}(980)$ as an emerging state. (iii) We finally
demonstrate that, although the coupling constants in typical effective models
might be large, the next-to-leading-order contribution to the decay amplitude
is usually small and can be neglected.
