Comparison between the evolution of Ω_kin for XXL-S LERGs and RL HERGs (red and blue shaded regions, respectively) and the prediction for LERG and RL HERG equivalent sources from Merloni & Heinz (2008), Körding et al. (2008), and Mocz et al. (2013). The hashed blue line is the scenario for RL HERG equivalent sources from Mocz et al. (2013) when a varying radio AGN duty cycle (f) is utilised. The scaling relation from Cavagnolo et al. (2010) was used to calculate the XXL-S Ω_kin values, and the RLFs were integrated from log[L_{1.4 GHz} (W Hz⁻¹)] = 22.4 to 27.2 (the full range of luminosities probed in the RLFs). The thick cyan curve shows the evolution of Ω_kin for the HERGs from Pracy16 (the values for z >  1 have been linearly extrapolated).