Representative SIMPL integration for (k_2,M, k_2,A) = (1.0, 1.0) with Q_U = 600. The Miranda–Ariel 5:3 resonance is not encountered, while the evolution is dominated by the Ariel–Umbriel 5:3 MMR. Ariel and Umbriel remain resonantly coupled throughout the 50 Myr interval shown, during which Miranda’s inclination continues to increase substantially beyond its present value. Because Ariel and Umbriel are not currently in this resonance, subsequent escape from the 5:3 MMR is required for this case to evolve toward the present satellite configuration.