Why were most of the hadith narrated by Abu Hurayrah(RA) and Anas Malik and not by Abu Bakr(RA) and Umar(RA) despite the very were the closest companions of the Holy Prophet(SAWS)?
You have raised an important question. Abu Hurayrah, Ibn Umar, Anas, Aishah, etc. have reported more traditions than Abu Bakr and Umar; the reasons are not hard to find. Let me try to explain: