Very interesting. I love the breed choices for your flock. We started with a mixed flock and fell in love with the orpingtons and legbars. Flower hens are at the top of my list to try as well. Beautiful birds.
I've seen the same thing you have concerning temperament. As babies, the legbars are a bit flighty but friendly while the orpingtons just want to eat. As they mature, our orpingtons gradually become really friendly and the legbars get a bit more independent.
I have 3 coops and the pecking orders are interesting. The group just reaching maturity now includes legbars, orpingtons, and black copper marans - including the 2 roosters I mentioned. The legbars, the smallest birds by a significant margin, run the place. The marans assert themselves but are laid back. But the orps, including the big roo, appear oblivious to any pecking order as long as there's ample food. My grown orpingtons in another mixed flock coop are similar. It's like they don't care about no stinking pecking order and they're huge so nobody bothers to mess with them. Our older CL, an olive egger with CL in her, and the 2 wyandottes are at the top in that flock. The orpingtons and barnevelders are... not.
We'll be shuffling birds around this winter with plans to do some breeding in the spring. The lavender orp roo will have 7 lavender ladies. The legbar will be over 4 legbars and 3 marans ladies to make olive eggers. I raised parrots for years but have never bred chickens. So leave it to me to fall for a rare breed and a challenging color of orpington that's not accepted yet. Oh well, you gotta start somewhere.
I'm in West Virginia. Definitely feel free to message me about legbars or whatever. I'm no expert but I've been doing a ton of reading and research the last year or 2. I'll probably start a thread to track progress once we start breeding.
I'm always excited to see other folks who have also fallen in love with cream legbars and want to breed them. Orpingtons too, of course. But the legbars are newer in America and there's a chance to get them recognized. Regardless, both are such amazing breeds and your birds are beautiful.