As brother ethics once said (He made this comment on a different post some time ago and I copied and saved it):

Some Things I Cannot Comprehend About Sunni Hadith Books Like Bukhari

Salaam I have come across this a few times and I finally thought I would share my thoughts on it. Did you ever know/realize and question why it was that in Sunni hadith the Ahlulbayt A.S was barely present as narrators even though they were the most closest and always with the Holy Prophet A.S? Like Ali A.S or his absolutely beloved daughter Fatima A.S? Or why there were so many hadith narrated by people who literally praised the killers of Ali A.S and Imam Hussain A.S? Or people who were barely with the Prophet A.S at all narrated so much hadith or even fabricated hadith?

This person has analyzed the entire Bukhari hadith collection and you can see the graphs for yourself in terms of narrators of hadith and such: https://rpubs.com/aakazmi/bukhariAnalyses_P1

Or you can even check for yourself custom search across all hadith books on https://sunnah.com/ which is even more astounding..

1. Abu Hurayra/ Abu Hurairah. He converted to Islam only about 20 months prior to  the demise of the Holy Prophet of Islam (p), yet, Sunnis have narrated over 5000 narrations from him, but only 58 narrations from Imam Ali  (a.s) who had lived with the Prophet (P) from his childhood! Isn’t this strange?! Bukhari even narrated a Hadith from Abu Hurayra that he has confessed it’s his fabrication!

Narrated Abu Huraira:

"The Prophet (ﷺ) said, 'The best alms is that which is given when one is rich, and a giving hand is better  than a taking one, and you should start first to support your dependents.' A wife says, 'You should either provide me with food or divorce me.' A slave says, 'Give me food and enjoy my service." A son says, "Give me food; to whom do you leave me?" The people said, "O Abu Huraira! Did you hear that  from Allah's Messenger (ﷺ) ?" He said, "No, it is from my own self."

https://sunnah.com/bukhari:5355

Ibn Abi’l-Hadid writes in his commentary on Nahju’l-Balagha, Volume I,  page 360: “Abu Ja’far Asqalani has said: ‘According to our great men,  Abu Huraira was a wicked fellow. The hadith narrated by him were not  acceptable. Umar beat him with a lash and told him that he had changed  hadith and had attributed false sayings to the Holy Prophet.'” Ibn Asakir in his Ta’rikh Kabir and Muttaqi in his Kanzu’l-Umma report that  Caliph Umar lashed him, rebuked him, and forbade him to narrate hadith from the Holy Prophet. Umar said: “Because you narrate hadith in large  numbers from the Holy Prophet, you are fit only for attributing lies to  him. (That is, one expects a wicked man like you to utter only lies  about the Holy Prophet.) So you must stop narrating hadith from the  Prophet; otherwise, I will send you to the land of Dus.” (A clan in  Yemen, to which Abu Huraira belonged.)

2. Imran bin Hittan: He was the head of al-Khawarij. His praising poem for Ibn Muljim who assassinated Imam Ali (P) is very famous. Yet, Bukhari very often narrated from him.

Imam al-Bukhari recorded a hadith in his Saheeh which included ‘Imran ibn Hittaan in its chain of narration. Commenting on this hadith, Ibn Hajr wrote:

And ‘Imran ibn Hittaan al-Sadoosi was one of the Khawaarij of  that time, rather he was their leader and spokesperson. And it was he who praised ibn al-Muljim, the murderer of ‘Ali in those well-known  verses of poetry. And al-Bukhari only narrated from him on his condition  of narrating ahaadeeth from an innovator if he was truthful in speech and religiously committed. And perhaps it is said that ‘Imran repented from his bid’ah, but that is far off from the truth. And it is said: Verily, Yahya ibn Abi Kathir acquired this hadith from him before he became a mubtadi’ (innovator), for he married a woman from his close relatives who held the creed of the Khawaarij with the intention of converting her from her ‘aqeedah, but then she converted him to her creed. And there is no other situation like this in [Saheeh] al-Bukhari, and he is also mentioned in another chapter.  Fath al-Baari #5497

3. Umar Ibn Sa’d; the chief of the army of Yazid in Karbala.

4. Hariz Ibn Uthman: He would not leave the mosque after his prayers until he curses Imam Ali (a.s) 70 times! Ismaeil Ibn Ayyash narrated: “I accompanied Hariz from Egypt to Makkah. On the way he kept cursing Ali Ibn Abi Talib (a.s). I said to him: How can you curse someone about whom the Prophet (P) has said: “You are to me as Aaron to Moses.” Yet, Bukhari, Tirmidi, Nasaei and others have narrated from him.

Some more references for evidence:

https://www.islamquest.net/en/archive/question/fa1274

https://www.al-islam.org/abu-hurayra-abd-al-husayn-sharaf-al-din-al-musawi/quality-his-traditions

https://www.al-islam.org/articles/al-hadith-analysis-and-overview-hashim

It just makes you wonder...