They look like lovely birds, I have heard that they are easily startled because their crest limits their vision(con) but their quirky actions are part of their appeal(pro), If it were me I would add the pullet, but I have been dying to try them out anyway..
I have two in my flock and they are bantams so smaller than regular polish... They never get picked on because they're too fast. Our jersey giant chases them, but he's to big and slow. None of my other chickens bug them and they all get along. I haven't seen any crest pecking. They get along with our ducks too.