Getting a second roo--could my roos tolerate each other?

I just found an ad on Craigslist for a spangled OEGB rooster, and I couldn't resist calling about him! My coop is currently without a rooster for the first time in ten years (my Japanese bantam rooster passed away from old age), and I'm excited to grab both a breed and color variety that I really like. He's only three months old, too, and apparently very tame. The current owner says she hatched him herself and he doesn't quite understand he's a chicken yet. He's also allegedly quite small, which I like. I imagine he'll make some pretty chicks!

However, I do have a small flock of seramas (a trio, two hens and a rooster) that I would eventually like to integrate into my coop at least during the warmer months, and I'm a little hesitant with the fact that the two roos could have issues with one another. I have twenty-four hens in the coop not including the seramas, though, and my coop is a good size--the run is 25' long by 15' wide and 6' tall, and then the henhouse adds another 10' x 10' or so.

Do you think there's a chance the two could coexist in peace with that much room and that many hens? Anyone have tips for introducing them? I suppose if it ends up they can't get along at all and keep getting each other bloody, the serama trio are quite happy in their current set-up and I could always move them back. Ideally, though, I would love to have two roos who can share the many hens. I've heard the ideal rooster/hen ratio is 1/12, so they would certainly be in a good ratio with twenty-six hens between them!

Anyway, any thoughts or ideas or stories are appreciated. (Also, if anyone has spangled OEGB rooster photos, I'd love to see them!)