theres alot more chance of Madara being Izuna because i doute he would have handed his eyes over and it was said that Madara died in his last fight with Hashirama and its obvious hashirama brought his body back for a burial, so he was pronounced dead and he had hashis dna which meant he could unlock rinnegan but if hes dead he cant. Overall it could be izuna using madaras alias to gain rep.
Doing post over phone, might be few spelling mistakes