  We investigate some aspects of Pi-stability of D-branes on Calabi-Yau
threefolds in cases where there is a point in moduli space where the grades
nearly or completely align. We prove that an example of complete alignment is
the case of a collapsed del Pezzo surface. It is shown that there is an open
neighbourhood of such a point for which Pi-stability reduces to theta-stability
of quiver representations. This should be contrasted to the case of the large
radius limit where mu-stability of sheaves cannot be extended out over an open
neighbourhood.
