  We investigate how adding a scalar resonance of a mass 125 GeV affects the
low-energy data support for the top-BESS model as well as its low-energy free
parameter limits. The top-BESS model is an effective Lagrangian, a modification
of the well-known BESS model, with an ambition to describe phenomenology of the
lowest bound states of strongly-interacting theories beyond the Standard model.
In particular, the SU(2)_{L+R} vector resonance triplet of hypothetical bound
states is a centerpiece of BESS-like effective models. The top-BESS model
assumes that the triplet couples directly to the third quark generation only.
This assumption reflects a possible special standing of the third quark
generation, and the top quark in particular, in physics of electroweak symmetry
breaking. Our findings suggest that the 125 GeV scalar extension of the
top-BESS model results in a higher statistical support for the model. The
best-fit values of the model's free parameters are consistent with the top
quark having a higher degree of compositeness than the bottom quark.
