We made the mistake of allowing them all to grow old together. Most of the great sides in the past seemed to have a player from the reserves ready to come in, or buy a player and slowly assimilate them with how they wanted them to play. The regular first teamer would then move on, his replacement step in and it was business as usual. We have tried to do this but the players brought in, such as Mangala, Bony etcetera haven't been up to the mark.