Found Rodney Prosper in the WW1Draft registration. It indicates his date of birth as November 7, 1899. Lists full name as Rodney Empress Prosper and shows Valcour as his closest relative.
Somewhat blurred so can't read everything. Says he was short and of medium build. Laborer at Plantation but can't make out the name. Definitely not Abby, maybe Lupas or Tepas or something similar. Race is black.