I don't think the brother is trying to be controversial in any way. I think you have misunderstood his intentions. There is only one mosque in my locality and it follows the 15 degrees ruling, hence there are some of us in the dilemma as to whether to inform others, who are ignorant of the matter, that this is not an "viable" opinion (inevitably this will cause some kinda of commotion by the community). However if the 15 degrees ruling is a viable opinion then why the need to cause commotion.