Well for the record, Twinrova refers to Ganon as the Daimaou about a dozen times in OoX.
When they resurrect him, he gives himself the title of Yami no Maou...just one of the reasons that I like OoT-WW-PH-LoZ-AoL-OoX as a segment prior to FSA-aLttP...lumps all the Daimaou game together, and all the games of Yami no Maou together. OoX then serves as the connector game, as he's referenced as having been the Daimaou when he was alive, but calls himself the Yami no Maou when he's resurrected.