  In neutrino event generators, for models for neutrino and electron scattering
only inclusive cross sections are implemented. When these models are used to
describe a semi-inclusive cross section, the event generator attaches the
hadron variables based on some assumptions. In this work we compare the nucleon
kinematics given by the method used in the GENIE event generator, e.g. in the
implementation of the SuSAv2 model, to a fully unfactorized calculation using
the relativistic distorted wave impulse approximation (RDWIA). We focus on
kinematics relevant to the $e4\nu$ analysis and show that observables obtained
with RDWIA differ significantly from those of the approximate method used in
GENIE, the latter should be considered unrealistic.
