Basic properties of the two first-ranked galaxies by stellar mass in CGs. Left plot: Stellar mass distribution for the two first-ranked galaxies in CGs at z = 0 for each SAM. Vertical dashed lines indicate the median stellar masses for the samples split according to the CG assembly channel. Inset numeric labels indicate the percentage of different types of galaxies (C: central, S: satellite, O: orphan) for each ranked galaxy sample. Right plot: Cumulative distribution of the look-back times at which the different ranked galaxies have undergone a galaxy-type transition from central to satellite/orphan. Solid and dashed horizontal lines at 1 and 0.8, respectively, are included as references.