Either people have fundamentally different, irreconcilable, values or they don't. If they do, then the argument I made is valid. If they don't, then CEV(any random person) will give exactly the same result as CEV(humanity).

This is a false dilemma. If people have some values that are the same or reconcilable, then you will get different output from CEV(any random person) and CEV(humanity).

And note that an actual move by virtue ethicists is to exclude sociopaths from "humanity".