  In our talk at Nihon university symposium, we have argued that the pipi / Kpi
production amplitudes F generally have different structures from those of the
pipi / Kpi scattering amplitudes T from a viewpoint of generalized S matrix on
the right bases, reflecting the quark-physical picture of strong interactions,
and that F should be analyzed independently from T. Here we discuss the
miscellaneous topics related with this argument: The conventional analyses by K
matrix method, which necessarily lead to the common phases and structures
through both T and F, are based on improper application of elastic unitarity to
the production processes. Recent criticisms on the method of analyses of J/psi
-> omega pipi and D+ -> K- pi+ pi+, which led to the existence of sigma and
kappa, respectively, are also based on improper application of elastic
unitarity.
