Indeed, γ-SQC is one of the best trajectory-based approaches and has been shown to outperform Ehrenfest dynamics and trajectory surface hopping approaches in model systems, in ab initio dynamics simulations, and in exciton-polariton dynamics for a model system. The natural question is then was the success in Fig. only belongs to γ-SQC as a superior MQC method or it is more general for any MQC method, as long as we include the key vibrational states inside the quantum subsystem? To answer this question, we perform additional MQC simulations to obtain k/k 0 using various other approaches.