Velocities of Individual GCs. First six rows: Left: Close-up of each GC in the KCWI FoV with F814W magnitudes. Middle and right: Blue-arm KCWI spectra focusing on CaH+K and Hβ regions. Each spectrum displays the recovered radial velocity, its offset from the galaxy’s systemic velocity (from integrated starlight), and the S/N. Last row: Radial velocity distribution of GCs around FCC 224. GC5 is excluded due to low S/N. The three Gaussian curves represent expected velocity dispersion from the stellar mass-halo mass relation (Moster et al. 2013) (red), stellar contribution alone (green), and MCMC-derived GC system dispersion using uniform priors (orange).