I'm not sure if your Contour has 3 coil packs or not. In the configuration you show, if you have three coils, then cylinders 2 and 6 DO share a coil. That could explain why you might actually have a bad injector but the PCM is reporting a misfire on cylinder #2. If it were me, I'd want to see the lean/rich reading or the factory scan tool report an injector #6 fault to be sure. Neither the injector nor the coil are inexpensive.
-Rod
