Isotropic rest-frame 0.1–100 GeV luminosity light curves of the S-GRBs 090510 (red squares), 081024B (green diamonds), 140402A (black triangles), and 140619B (blue circles) compared to that of the BdHN 130427A (blue downward-pointing triangles). The dashed black line marks the common behavior of all the S-GRB light curves, which goes as ﹩{t}^{-1.32}﹩. In our approach this communality follows straightforwardly from the equality of the masses of the emerging extreme BH.