I wanted to make an elaborate answer to your comments. But, I think, it would be better if you read history books written by Muslim Historians in Persian, and by Bangali Hindu and English Historians to know how the politics of Bengal as well as India was dominated by the Pathans since after the Muslim conquest of north and east India in 1192 and 1198 respectively. It was a Turkic invasion from what is now Afghanistan and Turkic settlement, but many Pathans also came with them or afterwards, and settled in these regions with their families.
These people played a big role that finally established a Pathan Dynasty by Bahlul Lodi in (probably) 1450s. This dynasty was defeated by the Mughal Babar in 1526 AD and these people vacated north India, fled towards Bengal and settled there. Sher Shah Suri of Bengal united these Pathan Bangali Muslims under his banner, fought two wars against Humayun in south Bihar and forced him out of India in 1539 AD.
These Pathans united with the local muslims of Bengal to oppose Mughal onslaught that again started in 1570s by Emperor Akber and continued for more than 30 years of intensive war. Read one history titled, " The last Pathan Hero of Bengal" written by a great Historian named R. K. Bhattasali of Dhaka University.
It is about the Afghan Osman Khan whose ancestors were Pathans, who settled in Bengal. He moved to Sylhet with his people after Pathan Sultan Daud Khan Karrani of Bengal was defeated and killed by the Mughals in 1576 AD in the Battle of Rajmahal. His uncle Katlu Khan was a General in the army of Daud Khan.
Note that other than Raja Pratapadittyo of Jessore, Raja Mukundo Rai of Faridpur, Raja Chand Rai and Kedar Rai of Bakla or Barisal, all the other Chieftains of Bengal, combinedly known as Baro Bhuyian, belonged to Pathan stock. Names are Ibrahim Khan, Masum Khan Kabuli, Karim Dad Khan, Rahim Yar Khan, Anwar Khan, Majlish Kutub of Faridpur, Osman Khan of Sylhet etc. People of this region fought against the Mughals under their leadership.
All of these Chieftains were sub-ordinate to Isa Khan Afghan who was regarded as a Pathan because his mother, Fatema Khanam, belonged to a Pathan family of Bengal. Isa Khan's father was a Rajput whose name was Kalidash Gazdani. He was a very rich trader in Bengal and had a good relationship with the ruling class. He took Islam and married Fatema Khanam. Emperor Jahangir called their son,' 'Afghan Isa Khan' in his famous memoir 'Tuzukh.' It was because of his mother's line of descent.
So, Pathan Muslims, who had settled in this region many centuries ago and had ultimately lost their identity and became Bangali Muslims, were the dominant force in the politics of Bengal and also of other parts of India for quite a few centuries.