  This work is a continuation in our series of papers, that addresses quark
models of hadronic structure on the light front, motivated by the QCD vacuum
structure and lattice results. In this paper we focus on the importance of
diquark correlations, which we describe by a quasi-local four-fermion effective
't Hooft interaction induced by instantons. The same interaction is also shown
to generate extra quark-antiquark pair of the "sea". Its higher order iteration
can be included via "pion-mediation": both taken together yield a quantitative
description of the observed flavor asymmetry of antiquarks sea. Finally we
discuss the final step needed to bridge the gap between hadronic spectroscopy
and parton observables, by forward DGLAP evolution towards the chiral upper
scale of $\sim 1\, {\rm GeV}^2$.
