For anyone who has spent time reading the disputes it becomes evidently clear, over time, that each innovation and kufri belief that these sects came out with was a bandage upon the previous false belief, which Sunni ulama refuted.
Take this belief of Nanotvi et al of creating another final prophet:
The truth is that anyone with common sense will then question the Quran (ayah of Khatam Nubuwwah) and hadith (la Nabi Ba'di).
In order to suture this gashing wound in their false aqeedah the deos (bandage 1) kept the belief of Allah can lie and (according to them) ergo, the Nass of the Quran is not requiring alteration and (bandage 2) Anbiya are not masoom. With this strategy the ugly aqeedah of Nanotvi et al can be kept on life support.
Like this you will find that all their beliefs which renegade from Ahl Sunnah are natural regressions to the underworld of shirk (ismail's belief that tawheed means humans can help one another because they are capable of it therefore asking one passed away is kufr as he is no longer "capable" of it).
Wa Allahu aA'lam