  In order for the core Fundamental Plane (cFP) to endure, small ellipticals
must not survive mergers with giant ellipticals, despite the fact the small
secondary galaxy can be as much as a million times more dense than the primary.
However, our previous set of experiments has shown that, for purely stellar
galaxies, the secondary does in fact survive mergers with primaries up to 100
times more massive. In this paper, we demonstrate the effect that a massive
central black hole has on mergers of cFP galaxies. Our results indicate that
the addition of a massive central singularity inside the primary galaxy
provides strong enough tidal forces to destroy dense cFP companions when the
secondary's orbital decay is sufficiently elongated. The destruction of the
secondary acts to preserve the original low central density profile of the
primary in the giant merger remnant, which allows the remnant to remain on the
cFP. On more circular orbits, though, the secondary is only disrupted near the
end of the merger, and the degree to which the secondary particles disperse
depends on the amount of orbital energy left in the merger. Hence, there are
some mergers for which the cFP is not preserved in our experiments. We find
that if the secondary is not dispersed, it forms a spinning stellar disk with a
central density that forces the merger remnant off the cFP.
