The reason why Sorin was called "unselfish busho" seems to be because Sorin in his later years sought for his longer life and peace rather than territory (as mentioned above, he was active in expanding his territory in the first half of his life.)
「欲の無い武将」と称されるが、これは晩年の宗麟が求めていたものが領土よりも自分の命の永らえや安らぎであったことからではないかと思われる（前述のとおり、前半生の宗麟は領土拡大に積極的だった）。