Yes! I'm optimistic now, because my chooks are looking great, and I'm getting along very well with these new quail that I have. You don't know how much fun quail are until you see one, and they're helping to lift my spirits!
There's no fighting Coryza. Once a chicken has it, if it survives (depending upon the severity of the illness, 10-70% of your chickens can die) then they become carriers for life.
How long did you have the roo before you noticed the smell? Was he separated the whole time or mixed in with the flock.
Updated to say: Sorry just re-read post and I see he was quarantined! Very smart. I wouldn't worry about the chores as much as I would have worried if he was in with the flock. Wishing you all the best!