The phantom troupe is identified by different analogies.
There is the jesus and his followers analogy, there is the obvious spider analogy but they are also likened to the calendar (12 months).
You found pretty good imagery for chrollo's abilities. Anoth simile is that chrollo thinks of himself as someone who acts without being selfconscious about it. He does what he thinks has to be done and says he isnt the kind of guy to express his motivations.
Jesus expressed the word of god, but not his personal motivation, too, in the bible.
Also, similar to early christians, there is a strong 'we against them' feeling inside the spider. People who are not inside the spider do not matter. Tho, unlike christians, the spider do not try to convert.
I think Togashi uses imagery, but doesnt really good deep into likenesses.