The key to the evolution process of his daughter's upcoming companion spirit was to provide her with several different options.
They had to be diverse enough to be relevant for different professions.
To put it in simpler terms, the options represented the specializations that the companion spirit and by extension his daughter would obtain.
"Let's try and stuff six of them into my companion spirit."
Six different ability seeds offered plenty of choice to his daughter. It was not too little and not too many. It granted his daughter enough variety without diluting the ability seeds too much.
"Six is a good number." He decided.
The source of these specialties came from the ability seeds, which Ves had to derive from different spiritual entities.