Why is Each Cygnus a Cygnus?

Guessing they went with the most popular weapons of each class -
Knuckles, Claws, Swords, Bows, and...no idea why f/p instead of i/l or heal.

Fire is a popular thing when you look at history. It's one of the four classic elements of ancient times, and it's really easy to conceive wielding fire as a weapon as opposed to lightning or ice (how did that one come about? I have no idea...). Heck there's even a theory about phlogiston being a base for fire.

As for the Cygnus concept origins question, I'd like to ask the guy that made F/P and I/L mages separate. That makes very little sense to me.