Final fates in the (M_CO, X_C) plane at the end of CHeB – obtained by evaluating the explodability scheme introduced in this work over the SN progenitor models from Patton & Sukhbold (2020) – and the missing RSG problem. To address it via failed SNe, stellar evolution models have to pass through the black-colored region in between the red vertical lines, which delineate the interval in M_CO over which RSGs are missing as Type IIP SN progenitors. The H16, S21, S23 and MESA ISOCHRONES AND STELLAR TRACKS (MIST; Choi et al. 2016) single-star models lead to different X_C(M_CO) tracks through this plane. For any stellar model choice, the missing RSG problem can only partially be addressed, and over a different range in M_CO (and, thus, also in log L_pre-SN,obs).