No no they all agree it is a Bida'ah, some just say it's a good bida'ah. Now back to 'Asr prayer, if you notice the definition of Bida'ah that I gave you above it does not include a consensus of scholars, so whether the scholars agree or not that a fifth Raka'ah is to be added I could care less, I will do it and I will call people to this and soon my entire village will start praying 'Asr five Raka'at and then this practise will spread and maybe in the future you'll have an entire sect within Ahlul-Sunnah who pray 'Asr as five Raka'at instead of four. Now I need you to tell me why I shouldn't do this? imagine that I am a deviant sunni who prays five Raka'at of 'Asr what would you advise me?