The three cycles are operating simultaneously and since the relative periods are so diverse, synchronicity cannot happen (accepting that the time-periods are correct). A complete  precession   (26,000 years) cycle through  6degs (21.5degs -> 24.5degs -> 21.5degs)  occurs roughly 4 times for every  eccentricity  cycle (100,000 years)  where obliquity   (41,000 years)