You seem to lack knowledge about arabic.So the order and Grammer of Holy Quran is decided by Kalifa and not by Allah. Thanks for that. All my Muslim brothers argue that it's by Allah.. Not even one letter changed.
There are, and have been, local variations.. like it is in every other language on Earth.
Caliph Uthman simply standardized the quran by anchoring it in the Quraish dialect which was the spoken dialect of The Prophet.
In Norwegian language there dialect variations in both word and pronunciation but every learned Norwegian would immidiately understand the meaning of the word regardless.
Forexample the word «Vann», meaning water, is spelled «Vatn», «Vann», «Vatten» in different regions.
A guy named Ivar Aasen collected all Norwegians dialect into a traditional norwegian called Nynorsk, which sounds very different from the more «modern» norwrgian spoken by most people in the eastern half of the country.