If we go back to 2015 (even that is generous for a current evaluation of ranking), we have Ortiz with wins over Jennings, Thompson, Scott and Hammer. Povetkin has Perez, Wach, Duhaupas, Hammer, Price and Hughie Fury. You could give Povetkin the slight edge there. Ortiz has suffered 2 losses to Wilder in that time and Povetkin has the loss to Joshua and the draw with Hunter (which I felt he lost). Most here would still rate Wilder highly in the division. So, for me the ‘loss’ to Hunter (who was more than likely outside most top 10s coming into the Povtkin fight) just keeps Ortiz above Povetkin. I'm not disagreeing with your thought process, just giving my own considerations.