Measured Φ_jet vs. for radio galaxies (open circles) and blazars (filled circles) shown in green. The plot is adapted from Zamaninasab et al. (2014), and it uses the corrections from Zdziarski et al. (2015; see also Chamani et al. 2021). The blazar 3C 454.3 is marked with the green diamond. The plot on the right zooms in on the values only for 3C 454.3 for four epochs. The light blue diamonds represent the Φ_jet values using B_1pc with measured CQ core shifts and with k_r = 1. If 3C 454.3 harbours a maximally rotating (a = 1) black hole, then the source appears to remain near the magnetically arrested disc state in the four observing epochs.