Panels showing that, of all GRGs with known lobe pressures, Alcyoneus is the most plausible candidate for pressure equilibrium with the WHIM. Top panel: we explore the relation between length and lobe pressure for Alcyoneus and 151 literature GRGs. Bottom panel: we compare the lobe pressure of Alcyoneus (green line) with WHIM pressures (red lines). For reference, we also show the lobe pressures of the four largest similarly analysed GRGs (grey lines).