So for summarize the evolution of the view of Ibn Abbas .
- First, he was "supprised" by Othmani Script and he said it's an script error because he was not aware of another recitations.
Then he has seen his recitation was abrogated by the otmani script.
And finally he did accept the Uthmanic script, because he has learnt the qu'ran through the another authentic recitation of Ubay Ibn Kaab and Zayd Ibn Thabit and finnaly he has accepted to taught an another authentic recitation.
And he has concluded saying:
Narrated Ubaidullah:
Ibn `Abbas said, "Why do you ask the people of the scripture about anything while your Book (Qur'an) which has been revealed to Allah's Messenger (ﷺ) is newer and the latest? You read it pure, undistorted and unchanged, and Allah has told you that the people of the scripture (Jews and Christians) changed their scripture and distorted it, and wrote the scripture with their own hands and said, 'It is from Allah,' to sell it for a little gain. Does not the knowledge which has come to you prevent you from asking them about anything? No, by Allah, we have never seen any man from them asking you regarding what has been revealed to you!"
Narrated `Ikrima:
Ibn `Abbas said, "How can you ask the people of the Scriptures about their Books while you have Allah's Book (the Qur'an) which is the most recent of the Books revealed by Allah, and you read it in its pure undistorted form?"
Narrated Ubaidullah bin `Abdullah bin `Utba:
Ibn `Abbas said, "O Muslims? How do you ask the people of the Scriptures, though your Book (i.e. the Qur'an) which was revealed to His Prophet is the most recent information from Allah and you recite it, the Book that has not been distorted? Allah has revealed to you that the people of the scriptures have changed with their own hands what was revealed to them and they have said (as regards their changed Scriptures): This is from Allah, in order to get some worldly benefit thereby." Ibn `Abbas added: "Isn't the knowledge revealed to you sufficient to prevent you from asking them? By Allah I have never seen any one of them asking (Muslims) about what has been revealed to you."
That's is how I see,chronogycally, the evolution of his view about the othmani script.
And may be it's like that we can reconciled the fact that he believed about the preservation of the qu'ran in his heart and above all in the utmani script.
You think it's accurate?