Dont forget the Plano Library also. More is there then McKinney. Go thru all the loose files and miscl. I have but was not looking for Wilson at that time. Ridgell McKinney.the 95 yo grandson of Collin McKinney is still alive the last I heard and lives in McKinney. The McKinney family lived near Mantua/Van Alystyne before,during and after the war. Ridgell is an enthusiastic historian/genealogist and was also related to Colonel JB Wilmeth. Ya never know...
Good hunting!
MWT