  We study a chain of magnetic impurities on a conventional superconductor with
spin-orbit coupling, treating the superconducting order fully
self-consistently. We find and quantify strong hybridization between the
topological edge Majorana bound states (MBSs) and in-gap Yu-Shiba-Rusinov (YSR)
states, which causes increasing energy oscillations as a function of magnetic
impurity strength, even when the direct MBS overlap is negligible. By treating
the MBS as a topological boundary state, dependent only on the effective mass
gap, we arrive at a fully parameter-free functional form of the its
localization which decreases with magnetic impurity strength, opposite to the
behavior of the superconducting coherence length.
