There were lords who aimed to strengthen power by eliminating top retainers, as well as retainers who sought to do away with lords who behaved against their interests or who were incompetent by means of coercive retirement, house arrest, etc.
有力な家臣を排除することで自身の権力を強化しようする藩主がいる一方で、家臣にとって不利益だったり、無能な主君を隠居や押込などの手段で廃立しようとする家臣も存在した。