I just noticed, from the log above of the 66-intree do you notice anything strange?
I do, ck wants dbus running to start otherwise it throws an errror.
├─(3150,Enabled,longrun) sddm-log 5
├─(1784,Enabled,longrun) dbus-log 1
├─(1790,Enabled,longrun) dbus 3
├─(3154,Enabled,longrun) sddm 6
├─(1785,Enabled,longrun) consolekit-log 2
├─(1797,Enabled,longrun) consolekit 4
Is this normal and expected process number order? You can't tell much when one of them fails to start as there is no process number.