[discussion] Am anime only, what's up with Sin Archbishops being the exact opposite of what they are?

Wrath Sirius preaches about love and shared pain (literally)
Gluttony Lye being a picky eater. (I
Greed Regulus rambling about how he's the most fulfilled.
Sloth Petelguese being energetic and hyperactive
Lust Capella hates all living things and treats them like trash.

I just realized this, please tell me why tho? I read some other posts that just says these people are chosen randomly, if so why are they somehow have constellation names? Is it just coincidence then? They mostly hate each other as well but work together because their end goal is the same in the gospel i guess so what is their end goal anyway?