the point is, gaben doesn;t know that zoro can still utilize acoc with the help of emma
He is scolding zolo because he thinks zolo is not using the power of acoc that he has for fights. So from gaben's perspective, zoro is not doing everything he can to support the condom.
But alas, what gaben doesnt know is, zoro has the magical sword emma to draw out acoc for him. So, even without knowing he has coc, he is still fighting using his full potential and power when he uses emma and koh