CS, thanks! I hope you weren’t insulted.
RSo, if you read my earlier points, you see I am making this exact point. While it’s not farfetched (especially for a lubavithcer) for someone to believe the Rebbe was the greatest in his generation, to say he was the greatest of all the generations is insane, and usually borders on kefira (because the answers are generally like “well the Rebbe was the only one with atzmus” etc.)