May Allah Guide us All to the Right Path. A suggestion from me as a brother, this kind of arguments are very weak and Imam ahmed's saying (which is mentioned in this video) is a per my knowledge not very authentic and even if it is authentic then this can only be applied to him and mutazilla leader who caused the whole fitna at that time. Why Am I saying this is a weak argument? Because there are many many people who were prominent in groups of people of bid'ah and their funerals were attended by thousands and thousands of people if not hundreds of thousands of people. May Allah Forgive our sins, guide us to right path, and make it easy for us to follow the right path. Ameen.
Aameen. I do not know the intricacies of what you say, Allah bless you. But I know that many noble scholars of our time and before our time have used this saying over & over again, and that is sufficient alhamdulillah. No doubt, the people who amass at the funerals of the misguided is another matter entirely. And all strength is with Allah, we ask Him for a good end