N-body simulation of post-FFB cluster disruption and the buildup of a smooth stellar disk component capable of exerting dynamical friction on the BHs of each cluster. Shown is the projected stellar distribution in one quadrant of the galactic plane, in a slice of thickness ±50 pc, at different times. One thousand star particles are selected at random from each cluster. The colors represent radial distance at t​ = ​0. The clusters survive mostly intact for a few tens of Myr, namely several cluster free-fall times, allowing FFB and core collapse to seed BHs in them. A significant smooth component is building inside-out to become dominant by ∼100 Myr, after a few galactic orbital times.