Muhammad bin Nayif and the Ministry of Interior

Nayif bin Abdul-`Aziz was Minister of Interior from 1975 until his death, when he was succeeded by his son, Muhammad.  In those years and decades, they established an intelligence network inside the kingdom.  Such a shift will certainly create a vacuum.  This is like the Deuxième Bureau of Lebanon: the Shihab and Hilu administrations ruled through it but then it was dismantled in 1970 by the Sulayman Franjiyyah regime.  How will Muhammad bin Salman trust the intelligence order of his rival?