  The potential existence of two separate classes of Long-duration Gamma-Ray
Bursts (LGRBs) with and without radio afterglow emission, corresponding to
radio-bright/loud and radio-dark/quiet populations, has been recently argued
and favored in the GRB literature. The radio-quiet LGRBs have been found to
have, on average, lower total isotropic gamma-ray emissions (Eiso) and shorter
intrinsic prompt gamma-ray duration (e.g., T90z). In addition, a redshift-T90z
anti-correlation has been discovered among the radio-loud LGRBs, which is
reportedly missing in the radio-quiet class.
  Here we discuss the significance of the differences between the energetics
and temporal properties of the two proposed classes of radio-loud and
radio-quiet LGRBs. We show that much of the proposed evidence in support of the
two distinct radio populations of LGRBs can be explained away in terms of
selection effects and sample incompleteness. Our arguments are based on the
recent discovery of the relatively-strong highly-significant positive
correlation between the total isotropic emission (Eiso) and the intrinsic
prompt duration (T90z) that is present in both populations of short-hard and
long-soft GRBs, predicted, quantified, and reported for the first time by
Shahmoradi (2013) and Shahmoradi and Nemiroff (2015).
