1) Who are these scholars ? and who was the first one that coined the word Uthmanic manuscript?
(Maybe)
https://en.wikipedia.org/wiki/Theodor_N%C3%B6ldekeAn all scholars have followed, as the narrative says that it is Utman who have collected "officially" the Quran. That is why one talks of the Utmanic rasm.
Why did he/she/they(the scholars) choose that third Rashidun Caliph /Rightly Guided Caliph Uthman ibn Affan who allegedly lived as caliph around 644–656 ? why not some one else? as that Quran comes some times 8th century
The narrative says that it is Utman who have collected "officially" the Quran and destroyed all the other ones. It is the consensus for the Muslim scholars.
Western scholars have followed the narrative, therefore the Muslim scholars. They did not doubt of nothing, thinking that Muslim were recounting an historical story (Mecca/Kaba/Zem Zem) and the rest of the story.
Based on orthographic and palaeographic studies, the manuscript probably dates from the 8th or 9th century. Radio-carbon dating showed a 95.4% probability of a date between 775 and 995. However, one of the folios from another manuscript (held in the Religious Administration of Muslims in Tashkent) was dated to between 595 and 855 A.D. with a likelihood of 95%..........
Radiocarbon dating is not reliable for artefacts which stretch for a short period of time. It is used for prehistorical stuff.
3) Are they (( who consider that Samarkand Kufic Quran comes from Uthman)) Muslim scholars of 9th century?
Muslim scholars of 9th century thought that all Quran they had were copied from the Uthman collection.
or fellows who wrote stories on Quran origins in last two centuries 19th/20th from Muslim as well as non muslim Ph. D. scholars??
19th/20th/21th non muslim Ph. D. scholars follow the narrative (that all Quran they have were copied from the Uthman collection.).
I am under the impression that you said once.. THAT THERE ARE NO REAL SCHOLARS ON THE ORIGINS OF QURAN....
Yes.
I guess you gave bit of credit to that ooold original ma John Wansbrough and NOTHING not even 1% to his student Patricia Crone.
Wansbrough did not have all the scientific points about manuscripts which, if he had had it, he would not have stretch the period of time of Quran composition until the 9th c. This would have change his theory.
Dye, Sinai, etc. retake the Wansbrough Quran theory of layers composition but in a much more very short of time (630-50/60)
For Crone, see my previous posts.