The Brazilian has already netted four times since completing a season-long switch from Saudi club Al-Hilal, but Bull believes that he will show his full potential in the coming matches.
"The Brazilian striker may not have received as much praise as Diogo Jota, but he's settled in quite well," the former England international told the Express & Star.
"Four goals and four assists is hardly a return to be sniffed at. He's had a hand in eight goals from the first 11 games but I still believe there's more to come from him.
"It's worth remembering he's only 23 years old and this is his first season in English football. He probably needs another dozen or so games to show us his true potential."
Wolves, who lie in second place in the Championship, play host to Aston Villa in the league this weekend.