Well the living proof of the real sequence of the Qur'an is the way it is preserved , starting with Surah Fatiha and finishing with Surah Nas. That is also not going to change .
Well, no one is questioning that. Indeed, the Qur'an is in a state preserved as God wanted it to be.
It is unnecessary to rely on this fact on Hadith as the Qur'an talks itself .
And also important to note that Hadiths were compiled and passed to us by some non-witness , third hand persons who did never see Prophet Muhammad nor listened to a single word from his mouth . Even none of the Hadith writer got those teachings from any of the companions of the Prophet . These supposed sayings and acts of Prophet were transmitted orally over 200+ years latter than the Prophet and his companions .
On the contrary , the Qur’an was collected , compiled and preserved from the very time of the Prophet and his direct companions who witnessed the Prophet and heard and learnt the Qur’an from his very mouth . Those copies of the Qur’an are all still existing intact all around the world . People discovering more ancient copies of Qur’an day by day whose scientific carbon-14 testing even pointing the period right to the year when Prophet was alive . InshALLAH more discovery will be coming in this regard .
Therefore Qur'an and Hadith came from different sources - one is from the companions of Prophet while the other one from third-hand persons .
No one is questioning the strength of Quranic preservation over the Hadiths. And that's why scholars have classified Hadiths into different categories as good, fabricated etc. But to say that there were all passed down by non-witnesses, nothing written is not true.
Here is an example of 1st century Hadith collection :
Are There Any Early Hadiths?
Here is a manuscript of Mālik's Muwaṭṭaʾ Dated To 179 AH.
PERF No. 731: The Earliest Manuscript Of Malik's Muwatta' Dated To His Own Time
Rejection of Hadith also disregards all the prophecies from Hadith that already came true and are still coming true.
You simply cannot reject all Hadiths on those basis. Watch the lecture by Dr. Jonathan Brown, a western ḥadīth scholar from University of Washington. [youtube]2J4uzCZ8ZRA[/youtube]
Hadith: Between Muslim Conviction & Western Criticism - Jonathan Brown - YouTube
Some excerpts from one of his lecture are:
“I have never been more impressed with anybody in history in my life than with Muslim ḥadīth scholars. I mean, when I first started studying ḥadīth I was very skeptical, I though it was all made-up and bogus but the more you study it the more you just appreciate the intense brain power of these people. I mean they memorized thousands and thousands of books and then they were able to recall all the different versions of ḥadīth from these books, and then they were able to analyze them and put them all together and figure-out where they all connect and make judgments about the authenticity of these ḥadīth. I mean even nowadays with electronic databases, and computers and word processing, I have hard time following even their discussions of the ḥadīth - let alone their original mastering that they were drawing on. It's almost unbelievable... It's almost unbelievable, and if you didn't have the books in front of you that they wrote, I wouldn't believe it personally....”
Finally, by rejecting the Hadith, you actually are rejecting the commands of Allah(swt) as stated in the Holy Qur'an:
As stated in the Holy Qur'an, we are supposed to follow Allah and His messenger(pbuh) both : "Say,'Obey Allah and His Messenger': But if they turn back, Allah loveth not those who reject Faith." (Al-Qur'an 3:32).
Question#1 : How do you Obey the Messenger(pbuh) without knowing what He asked you to do ?
Answer: You can't. The only way I know is through the Hadiths.
Again, as stated in the Holy Qur'an : "Say: If it be that your fathers, your sons, your brothers, your mates, or your kindred; the wealth that ye have gained; the commerce in which ye fear a decline: or the dwellings in which ye delight - are dearer to you than Allah, or His Messenger, or the striving in His cause;- then wait until Allah brings about His decision: and Allah guides not the rebellious." (Al-Qur'an 9:24)
Question#2 : How can Prophet Muhammad(pbuh) be dearer to us than our own fathers unless we know who he is and his ways ?
Answer: You can't and the Qur'an doesn't give us enough about His life and His ways to be able to do that. The only way I know is to know Him through the Hadiths.
And God knows best but I see those above scenarios(not enough info of Prophet Muhammad(pbuh) in the Qur'an) as a wisdom of God Almighty so people cannot come up with excuses to not follow the Hadith.
Peace.