can you quote saheeh hadith in which omer aur ayesha said they them self did naskh without the premission of prophet..
or any other hadith in which prophet gave permission to ummah to do naskh on their on..
the hadith you qouted is about naskh that took place during the time of prophet. naskh stop after the death of prophet... like allah said in quran
None of our revelations do we abrogate or cause to be forgotten, but we substitute
something better or similar: knowest thou not that Allah hath power over all things?”
[Al-Qur’an 2:106]
thus it is allah who do naskh through massenger and it cant be done by any other person...
do you know that their is fatwa by all school of thought that who ever belief that quran is distorted and this in not the quran left for us by the prophet is a kafir...
as allah himself said about quran.
Allah says: "We have without doubt, sent down the message and We will assuredly guard it (from corruption.)" (15:9)