  The initial state is one of the greatest uncertainties in heavy-ion
collisions. A model-agnostic approach is taken in the phenomenological Trento
framework which constrains parameters using Bayesian analysis. However, the
color-glass condensate (CGC) effective theory predicts initial energy densities
that lie outside the recent Bayesian analyses due, in part, to the assumption
in Trento of event-by-event multiplicity fluctuations following a $\Gamma$
distribution. We compare the Trento-preferred $\sqrt{T_{A}T_{B}}$ scaling to
CGC-like $T_{A}T_{B}$ scaling coupled with log-normal fluctuations in $AuAu$
and $dAu$ collisions and find there is a significant impact on the multiplicity
distributions and on the eccentricities, which may affect the extraction of
viscosity in small systems.
