i have just thought of this in mc they say that the hold festivels ever 100 and there are kingstine pieces but none occur in oot plus in the begining there are monsters in the field and places even before ganon now in mc it says at some point the piccro make a four sword and the hero seals away all the montsers in this land which means there are no more monsters also i think mc takes place after WW because look at the land of hyrule in mc there are places not located in the oringinal hyrule like veil falls a swamp no zoros domain this is becuses this land is the place that toon link and tetra(zelda) found to be the new hyrule and if its after ww there would not be anymore zoras and few gorons like in mc and this land has the piccro plus the lands sacred sword is the four sword as the master sword was left back in hylrule
nice try but your problem with that is Vaati releases the monsters from the chest that the four sword was protecting and Vaati is the one sealed in it at the end, not the monsters, so there could very well have been monsters still roaming the world. and you said that it has land that is not in OoT, but if you pay attention to the actualy way the geography is set, it is quite similar to OoT with one difference. there is a volcanic mountain in MC (just like death mountain in OoT), there is a river/lake in MC (just like lake hylia in OoT), and there are woods in MC (just like the kokiri forest in OoT). the only difference is a swamp, and for all we know, the swamp could have dried out and turned into a desert that becomes the desert in OoT. the river and woods are in just about the same locations relative to the castle as they are in OoT, and the mountain is behind right next to the castle just like in OoT.
another reason i would not put this game after WW is because there is no ocean coast to the map. if this is the new land that link and tetra find, then there must be an ocean coast somewhere. and yes, there are few gorons and no zora in the game, maybe this game takes place before those races really flourished. also in the game, there are still river zora which are the evil zora that shoot things at you from the water. if there are river zora, then there are regular zora too, just not in the game.