  An extension to our previous study on Nuclear Parton Distribution Functions
(nPDFs) using Light-Front Holographic Quantum Chromodynamics (LFHQCD) is
presented. We focus on applying the effects of nucleon motion inside the
nucleus (Fermi motion/smearing) to deuterium, extending our nPDFs (and hence
the DIS $F_2$ structure function for deuterium, $F_2^D$) to the superfast, $x >
1$, region. We utilize four different deuteron wavefunctions (AV18, NijmI,
NijmII, Nijm93) in this study. We find that our model, with no additional new
parameters, is in excellent agreement with deuterium EMC ratio data obtained
from the BONuS experiment. Looking beyond conventional nuclear physics, and in
anticipation of ongoing 12 GeV experiments at Jefferson Lab, we use a LFHQCD
ansatz to predict the contributions of an exotic six-quark state to $F_2^D$ in
the superfast region. Our results are that the effects of using other
potentials are about the same magnitude as six-quark effects - both have small
effects in $x < 1$, but have significant contributions at $x > 1$.
