Rowan was not surprised when he saw the branding of Old Man Seed in his Supreme Circle, because if it was him he would have done the same thing, although not as directly as the old man who had simply snuck in an unknown brand inside the Supreme Circles, and Rowan wondered if this branding could only be found in the technique that Old Man Seed impacted to him alone, or was it in every Supreme Circle technique out there in reality.
If it was the former then it was a concerning development, but something that was expected, but if it was the latter, then some of Rowan's most outlandish speculations about Seed might just turn out to be the truth.