Due to the above operations, it was written in 'Kansei-jushu-shokefu' that the reason why he could not see any one was that 'though Nagakata had grown up, he was seriously sick and, as a result, he could not walk and could not give audience' and that his application for permission to 'select some one to succeed his family who could bear the serving as' a guard in Nagasaki instead of Naritaka KURODA who was from the main family and was young was permitted.
こうした工作により、「寛政重修諸家譜」には「長堅長ずといへども重病ののち行歩かなはずして拝謁することあたはず」と御目見のできなかった事情を記し、さらに本家の幼少の黒田斉隆に代わり長崎警備の「奉仕にたへたるものをえらびて家を継しめむ」ことを願いを許可されたとある。