Status: IN
The fundamental explanation for composition's quantitative scalability advantage (avoiding M×N and 2^n class explosions) is the runtime/compile-time divergence: inheritance creates its combinations at compile-time as static classes (hence exponential class proliferation), while composition creates them at runtime as dynamic object configurations (hence linear class requirements with combinatorial runtime flexibility).
Runtime/compile-time gap directly explains why composition avoids class explosions
Depends on (SL): runtime-dynamism-grounds-composition-advantage, explosion-prevention-validates-composition-paradigm