He let Sun Deng remain in the rear. At that time, Sun Deng made some laws to prevent crime, which achieved successful results. However, Sun Deng never succeeded his father, dying from illness aged 33 (by East Asian reckoning).
He allowed Sun Deng to remain in a subordinate role while he implemented measures to prevent crime. This led to successful results but was ultimately cut short by Sun Deng's untimely death from illness at the age of 33.