शक्तिमत्येकपुत्रे तु लुप्तपुत्रोत्पत्तिरात्मानमादध्यात् न चैकपुत्रमिति ॥ कZ_०७.१७.३१ ॥
śaktimaty ekaputre tu lupta-putra-utpattir ātmānam ādadhyāt na ca ekaputram iti
But if there is a single powerful son, the possibility of the son’s loss (and thus loss of issue) must be counted against oneself; therefore, it should not be treated as ‘only one son’ in a simplistic way.
Do not assume that a strong single heir guarantees stability; the state must price in the catastrophic risk of losing that heir.