But Gibson thinks the quality of the striker means he will get plenty more for the Toffees.
"He's a bit like Michael Owen or Van Nistelrooy in the box," said the Republic of Ireland international.
"He's first class and I don't think there's many better than him in the Premier League at the moment.
"The vein of form he had when he first came was special and from a football point of view I think we knew he couldn't keep it up constantly.
"Every striker goes through a lean spell but it hasn't taken him too long to score again.
"He's definitely up there with the best goalscorers I've played with to be honest. His finishing is unbelievable."
Gibson said Jelavic makes life easier for him with the options he offers.
"He makes some great runs and he makes the passes easier for me," he said.
"He makes my decision for me by his movement.
"He's a great player and luckily he's scoring again which is important for us."