OK, I have a little time before I clock in.
My reason for wanting to have 2 different roosters is to have a backup if things go bad without having to wait to raise another one from the egg and to maintain some variety in the flock.
I probably won't keep Ludwig the Black Langshan for more than a year, but I like both is beauty and his good temperament. At just shy of 8 months he's fertilizing all but my most dominant hens so subtly that I've never actually seen him mate.
This morning, with Red crowing and approaching a couple of the younger but mature pullets, I saw Ludwig administer a little discipline -- chasing Red a few feet but not pursuing or bullying. Also, I want to hatch some sex-links from him with the French Cuckoo Marans and Dominique girls.
I want some pure Blue Australorps, but I don't know if I'm ready to settle down to just one breed and have all birds that look alike. I want this breed for their beauty, their nice eggs, and because Australorps fit my mental idea of "chicken" almost perfectly.
If it works out to get the Marans eggs from the lady who bought Stripes, I will probably replace Ludwig with a Blue Cuckoo Marans next year -- possibly giving him to my brother-in-law as a yard ornament bird.
Maybe it would work out to divide the flock. Maybe I'll need to rotate rooster breeds. Maybe I'll need to breed Blue Australorps and buy chicks of other breeds to keep some flock and egg color variety (should sell better than all one color). I'm collecting data now and will surely change my practices with experience.