I agree with you in theory. However in two straight games defenses have made us one dimensional for large parts of those games. During those stretches they dared Casey to beat them, and he could not.
Even though Casey has more mobility, it hasn’t really been a huge factor. He’s not a threat running the rpo that defenses are worried about. Card is supposed to be a mobile qb also. He looked slow against arkie, but that may have hesitancy. Either way Casey isn’t winning huge games for us with his legs.
Overall, we don’t have a franchise qb yet. Maybe Card can work more of the field with his arm strength. Either way we need to understand what both qbs can do by the end of the season.