The plan to provide his castle was originally proposed by Takauji HORIO when they were discussing in advance, but Katsutoyo borrowed it (Hakuseki ARAI, "Hankanpu" (Genealogy of the Protectors of the Shogunate).
この居城を提供する案は堀尾忠氏と事前に協議した際に堀尾が提案したものを盗んだといわれる（新井白石『藩翰譜』）。