1.Imam Ahmed Raza Khan was simply a main leader of Sunni community at that time.See Page 5-10 [].Researchers who have expertise on this Subject have only considered Imam Ahmed Raza as main leader of the movement.No one has used the word founder for him.He is considered a reformist Ahle Sunnah Scholar by neutral scholars of west.Imam Ahmed Raza and the websites associated with Ahle Sunnah movement have described him only a main leader.There was another Prominent leader before him named Allama Fazle Haq Khairabadi and many leaders were associated with him.Moreover founding stands for establishing something new,but Ahmed Raza Khan did not started or established a new movement.He was a reformer of the Islam.Reforms stands - to restore to a former good state, or bring from bad to good.
2.He was not involved in Madarsas establishment.Your point on Madarsa is not Neutral.He had all resources and infrastructure to establish Madarsas but he focused his life on writings.He authored more than 950 Books on all topics of Islam and sciences. 
3.Ahle Sunnat Wal Jama'at are in huge majority worldwide,it is an accepted fact.Similar is the case with India ,Pakistan and Bangladesh ,Ahle Sunnat are in majority.This does not established a linkage to Pakistan.Ahle Sunnat leaders had divergent views on Pakistan movement.Referenc: Ahmad Riza Khan Barelwi: in the path of the Prophet(Sallallaho Alaihi Wassalam) by Usha Sanyal.
4.Same as already discussed.