The Ivorian moved to the Liberty in the summer from Vitesse Arnhem.
Vorm declared: "In the dressing room you see just what a monster he is.
"When it comes to Robin (van Persie) I always think of ballet, everything is graceful to him. Bony is a very different type, who has African power, but also a good technique.
"If he plays every week, he will get 15-20 goals, I'm 100 per cent sure."
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