As a castle where Shogun would stay it is rather small and its defense capacity is questionable, and Ieyasu's vassals addressed these issues to him; it is said that he responded saying, "if we can hold off [the enemy] for a day or two reinforcements will come from surrounding regions" and "if it were to fall to an enemy, a strong fortress would be more difficult to retake."
将軍滞在の城としては規模も小さく防御能力に問題がありそうだが、家臣の疑問に対し家康は「一日二日も持ちこたえれば周辺から援軍が来る」「万が一この城が敵の手に落ちたら堅城だと取り返すのに手間がかかる」と答えたと伝えられる。