  We study the post-quench dynamics of unitary Bose gases using a two-channel
model, focusing on the effect of variations in the width of the Feshbach
resonance due to density changes. We generally find that increasing the density
leads to a corresponding increase in the production of closed channel
molecules, a decrease in the build up of quantum depletion and a transition
from linear to quadratic early-time growth of the two-body contact as well as
the condensed pair fraction. Motivated by the presence of closed-channel
molecules in the unitary regime, we study the embedded two-body problem finding
a transition from open to closed-channel dominated dimers due to many-body
effects.
