Sylvester don't fight ugly. He's a honest, workmanlike type of fighter, and always gives his best in the ring. A nice, likeable guy outside of the ring. Very popular in Germany. But he's also limited talentwise, he's not good enough to be a real contender for one of the major belts, his team knows it and that's why he keeps fighting C-level opponents and struggles with B-level fighters like Asikainen and Rotolo...
I wouldn´t compare Asikainen with Rotolo. On his day, an experienced amateur like Asikainen with a good footwork and killer left hook will KO anyone. Sylvester is not such a threat.
He has knocked out Sylvester and now Yory Boy. I´d say he has done more than the fighters you so highly hype here.