Genghis
While there might be issues with multiple instructors, aeroplanes and environments I think a bigger problem might be the fact that you've got someone who's effectively decided he knows best. The tail is wagging the dog. I had a student like that some time ago - he knew best how he wanted his training delivered, including what bits of the syllabus to do next. Very keen to get onto nav so eventually I let him but warned him that it would most likely end in tears. It literally did, and they weren't mine.
Your man like mine needs to 'take instruction' - in all its forms. I'd walk away - until it does end in tears; then you can offer to fix things. On your professionally-considered terms.