Figure 1: Motivation of AKI. (a) Under fixed model capacity, inherited constraints can restrict the representation reorganization required by current supervision, increasing old–new distribution overlap. (b) Cross-step optimization analysis shows that adjacent incremental objectives generally correspond to different stationary states, θ*_(t−1) ≠ θ*_t, while inheritance constraints can restrict current-task-aligned adaptation. (c) Empirical analysis reveals cross-level coupling among response, feature, and distribution variations, motivating coordinated knowledge reorganization across three levels.