Think the problem may be with Laura.
Marco is forcasted to be moving at a decent clip and be a Cat 1. They have handled that before. While still a hurricane it's not the devastating type.
Laura on the other hand could be a real problem. It's forcasted to slow down a bit once in the gulf. If it goes over roughly the same area as Marco the upwelling from Marco would inhibit rapid intensification. If it doesn't take the same path it could bomb making for a potentially terrible situation. Right now it's current path is the Texas/Louisiana border, well west of NO.
Hopefully NO just gets residual effects from it. But your right, it could be a bad week.