This information does make the story more interesting. If the January 1865 oath of allegiance is accurate, MRB volunteered from Choctaw County in November 1861. He should have then gone to Memphis to join his command. On April 8, 1862, MRB surrendered with the garrison of Island Ten and went to prison for six months. He could have been the father of a child born on Nov. 22, 1862, but conception must have taken place five-six weeks before April 8, 1862. It's stretching the imagination a bit.
According to the 1900 census, MRB had been married for 35 years. Again, if the January 1865 oath of allegiance is accurate, MRB had no family (wife or children). Based on these two records, I would have assumed a marriage date in 1865, shortly after MRB's return home. You will recall how MRB in his pension application describes being "held" north of the Ohio River after becoming a prisoner of war. A condition of the oath of allegiance taken at Nashville required that he stay north of the Ohio until hostilities came to an end. MRB could explain that he was bound by oath to obey his terms of release, but he wasn't in prison when the war ended.
If you have an official record from Choctaw County, we have a marriage date of Apr. 22, 1863, and a child born five months earlier. Maybe the girl's father kidnapped MRB to make him do right by her! MRB returned from prison in September 1862, his former company reenlisting and returning to service as Co. "F", 54th Alabama Regiment. If he was in Choctaw County in late April of 1863, it explains why he doesn't mention the Vicksburg Campaign in his pension application.