Hassan Ilyas Sahabs Post On Tawatur
If a faqeeh tries to introduce an innovation on his own, it would get challenged by some other scholar/faqeeh or the masses, either way it wouldn’t fulfill the conditions of ijma and tawatur. The example you used for Fajr prayer has not been transmitted to us through ijma and tawatur, has it? The 5 categories you are citing do not constitute a practice, but a jurisprudential concept – and even that doesn’t have unanimous agreement.