Just playing the devil's advocate. And thinking how would dear DM react , once he starts realising that Santo is indeed defining a place in his house or heart should I say!
He certainly is not going to like it. It doesn't go well with his current image - strong, ruthless in heart, egoistic, overpowering...the adjectives can go on.
Remember how he shooed her away from his room, when is mind conjured up her singing shu's song.