You have some flaws When  Brahmans marry it is neither anuloma or pratiloma You are right when you say that many of DN Tagores other sons had non Pirali brides This is also there in Sivnath Sastris Histry book on Brahmo Samaj st ed at P  late Babu Haradev Chatterji father in law of two of Debendranaths sons  Chatterji is one of the  highest castes of Bengali Brahmins and definitely not Pirali The difficulty in arranging Rabindranaths marriage was his associating with beef eaters and his loose early life Both Dwarakanath and Ram Mohan Roy had the same problem and used to employ  sets of cooks Muslim and Hindu which upset all the womenfolk in their houses