So many subscribers have more then 1 profile so that they can endorse their own mods and screenshots. Some might have up to 40-50 profiles. This 5 millions subscribers is far from accurate I'm sure.
create a character with the race and face you want to use. When you are done open the console and type "savepcface 001" (without the quotation marks). When you create your companion in the creation kit you CAN import that .npc file. IT WORKS ;)