  It has become traditional to assume that the Dirac structure of the
phenomenological quark confinement potential is scalar $\otimes$ scalar. We use
the heavy quark expansion of the Coulomb gauge QCD Hamiltonian and the Flux
Tube model to demonstrate that this is true but in the effective sense only.
The demonstration contains some surprises: confinement is actually vector
$\otimes$ vector and it is nonperturbative mixing between ordinary and hybrid
$Q \bar Q$ states which generates the scalar-like spin dependent potential at
order $1/m_q^2$. Thus the existence of hybrids is crucial to establishing
well-known spin splitting phenomenology. Finally, the resolution also indicates
that the gluonic degrees of freedom in a hybrid must be of a collective nature.
