FrozenNorth
Hero
This looks to me like you are suggesting that you would have difficulties placing red dragons (CE) in the City of Brass. Huh. Seems like instead of opening possibilities, alignment is closing them off.That is interesting. So damage type is more defining of who gets along? The Haughty and Cruel get along better with the Gregarious more so than with Vain and territorial creatures, if the damage type matches.
Also, what alignment is Haughty and Cruel? What about Gregarious? Can a monster be LN and still very friendly?
But to answer your question, yes, it makes a lot more sense that a creature with a fire theme would be found in the City of Brass whatever its alignment rather than an ice-themed LE creature (or even an lightning-themed dragon, like blues).
Maybe it makes sense for them to work together even if they have different outlooks. Maybe one is enslaved by the other. Maybe this particular red dragon (or this group of them) rejects stereotypes.