By rot you mean players reaching the end of their Careers?
look at the true liverpool greats paisley and shankly when great players came the end they got chased , paisley did it more than anyone IE smith, hughes, ray kennedy , phil thompson even dropping dalglish because his form dipped badly , shankly got rid of hunt, saint john , yeats, lawrence in one cull because thats what great managers do , even ferguson down the years did it , but dalglish didnt do it and the team festered .