One of the most well-suited formulations for the analysis of exclusive processes involving hadrons may be provided in the framework of light-front dynamics (LFD) due to its distinguishable simplicity in the treatment of vacuum fluctuations. The zero-mode complication is nevertheless still an issue to establish LFD as a successful phenomenological tool for the analysis of exclusive processes. In this talk, we discuss the issue of zero-mode complication in the heavy meson decay processes such as in the exclusive semi-leptonic and rare decays of B mesons. We present our calculation of the weak transition form factors for the semi-leptonic decay processes as well as the tensor form factors for the rare decay processes and discuss our power counting method to pin down the existence/nonexistence of the zero-mode in each of these form factors. Our findings from the present analysis indicate that the light-front zero-mode complication is either absent or controllable in the heavy meson decay processes.