There are about 20 William Stewarts in Indiana in 1840 and more in 1850. In Montgomery county there was a William who married Rhoda Burks 9/22/1821. Also there is a William who married Emily King 6/8/1841, and a William H. Stewart who married Phebe T. Morris, 11/21/1847. all of these lived in Montgomery county, but I dont recognize the William you listed. I am a descendant from William and Rhoda Burks.