The Dark Halo in galaxy formation

The Dark Halo in galaxy formation may be the result of outward drift in stellar evolution. The majority of stars are formed at the Galaxy Core (the Torus) from matter escaping the SM Central Object. This explains the ‘paradox of youth’ as the Galaxy Centre is full of young stars. These spiral away over time and are constantly replaced so that large, unstable and short lived stars are to be generally found in the Bulge. Types that are long lived and stable may spiral far across the Galaxy giving an ageing effect according to distance from the Core.
One by one they burn out as the further from the Galaxy Centre the older the material and hence more likely to be dark. Eventually almost all are gone producing the Dark Halo as a graveyard of stars and an expression of general outward spiralling drift from the Galaxy centre. This questions the validity of the Central Object as a Black Hole.
Clusters and Nebulae also age over the Galactic Plane as part of the same general outward orbit.
Totally random and disruptive merger in the Standard Model cannot (as in Impossible) describe this ageing over the Galactic Plane.