If he's not effective, then you should probably let him know that his methods are wasting time. If he's effective, then you're the one who is wasting time. I do

If he's not effective, then you should probably let him know that his methods are wasting time. If he's effective, then you're the one who is wasting time. I don't think it needs to be more complicated than that. One of you is in the wrong, the question is who.