Sylvester was happy to have found a new pawn, and he knew why the Duke was being so kind to him. After all, King Riveria specifically married a woman wizard to have a highly talented son because he didn't have faith in his other offspring. This meant the Duke was magically and physically weak and required the support of high-value individuals like him.
A god's favored candidate, the famed blessed Bard of the Lord, the highest talent in decades. All this combined ensured that Sylvester would be a top man sooner rather than later. And that's how the Duke can secure the throne.
But that left Sylvester in the wonder of one thing. 'Is he as dumb as Romel?'
Heck, even Romel was not dumb. He was just too young and hence was vulnerable to brainwashing. But, Duke Conrad was a grown man, and to brainwash him—if possible—won't be fast and easy.