My understanding is that the early model panthers they did have at Kursk were such a maintenance nightmare that they had no effect. More of them would not have helped until the teething problems were resolved.
The Panther-A model was a bit of a mess because of transmission problems, among others. But the Russians noted it very clearly and captured a few when the offensive was called off and the Germans pulled their forces back. The super 75 gun made them about as effective as a Tiger I. But, yes, the teething troubles at Kursk caused some real fast redesign work for that model.