I have some of their rir hens right now (local co-op buys from ideal). They are now starting to lay - and very well. I also have a few heritage birds about the same age. They do look somewhat different. The production birds are much lighter in color, a little more flighty, and smaller. I...
Ameraucana for the blue eggs (med.), EE for the green eggs (lg), BCM for the dark brown eggs (very lg), golden sex links for the beige eggs (lg), and leghorn for the white (lg). Just a few of the endless possibilities!
I agree with putting in a rooster. I have one rooster that I use for that. I call him the peacemaker. Whenever there is a squabble, he runs right over and breaks it up. He is also quite tame with people.
Most roosters will defend their hens. Since they are so young, I would wait a little longer and see if either one becomes aggressive - which you do not want. Wait until they are sexually mature. Also, you can better tell if they have any faults that might be passed on.
I hatched a bantam cochin pullet that was a lot smaller than the rest. She is 4 months old now and still smaller, but the difference is not as great. She is fine, just going to be small.
My vote is for mealworms. I ordered 1000 through the mail. I now have tens of thousands just a few months later just using one of those 3 tier plastic drawers.