Cadillac was fading as a player. Jose thought that ,Iker didn't.
Jose dropped him for Antonio Adan,who himself struggled with the limelight of being first choice at Madrid. So the next season ,Jose signed Diego Lopez and benched Iker for most of the season. Lopez impressed when played and was instrumental in that Madrid win at O.T
But stories of disharmony within the Madrid ranks were rampant at this point. Considering that Iker's gf is a journalist, most people think he had something to do with it.
The following season,Jose was gone and Ancelotti was hired. In order to negotiate the gk issue,he played Lopez in the league and Casillas in cups.
A year later Lopez who hadn't done much wrong was sold to A.C. Milan . That was largely viewed as political play by Iker and didn't go down well in Spain.