Dear ~angelz~,
From your posts, I can guess that you are a Gaudiya Vaishnav. Nothing wrong in that. But, as you know, Gaudiya Vaishnavas have their own interpretations of scriptures. And there are various other interpretations as well.
You have asked who Radha was married to. Some scriptures say that she was married to Krishna's uncle Vrishbhanu. Of course, Brahm Vaivart Puran says that it was a shadow Radha, who married Vrishbhanu and real Radha married Krishn.
Outside Gaudiya Vaishnavism, majority of schools of faith do not consider Garg Samhita as authentic. And Brahm Vaivart Puran is obviously of much later origin. I have nothing against sage Garg. My own gotra is Garg.😊 It is just that I want to tell about various schools of thought.
You have written that Bhagavatam refers to Radha secretly. But why secretly? One reason is given is that on taking Radha's name, Sukdev would have gone into trans. Do you also subscribe to the same view or some other? If it is the same, then I agree that it is a possibility but not the only possibility. Another possibility is that Radha is not mentioned in Bhagavatam at all. When the name Radha is not clearly mentioned, how can we claim that she is mentioned secretly?
You have written that Krishna Charitra is a part of Mahabharat. No, Krishna Charitra is not a part of Mahabharat. It is written by poet Bankim Chandra Chattopadhyaya.