Scatter in SMBH mass. Same as Fig. 8 but for z_ffb​ = ​10 and for three caes: Middle, blue: the fiducial case, with ϵ​ = ​0.2, halo mass at the FFB threshold, and seed BHs of m​ = ​10⁴ M_⊙, is recovering the average BH mass at z​ = ​4 − 7. Top, magenta: with ϵ​ = ​1 and halo mass 3x the FFB threshold, the model reproduces the most massive BHs at z​ = ​4 − 7. Bottom, green: with seed BHs of m​ = ​10³ M_⊙, the BH growth in a hot disk is not sufficiently fast.