Hi Wendy,
??? I don't have a John M. Daniels in my files who matches your John. I assume that by Amite, MS you meant Amite County, MS? I found J. M. Daniel in the 1830 Amite County, MS census. I did not find any Daniel/Daniels in the 1840 or 1850 censuses of that county. I also did not find any John, William or Josiah Daniel/Daniels in the 1850 or 1860 censuses that match them. Do you have a bit more information about them? I did find Causeys in the 1820, 1830 and 1840 Amite County, MS censuses.
?? Your DNA testing is all autosomal DNA testing which can only reliably determine matches about 3 to 4 generations back, if you have good primary record evidence, so your DNA tests will probably not be very useful. If you can trace a direct male Daniel/Daniels descendant of John, and get them to take a Y DNA test, that may show which Daniels lines you do, or do not, connect to. Y DNA is passed only from father to son, and changes very slowly over time, so is very useful for tracing direct paternal ancestry.
Best,
Kevin