God. If Nintendo put all their members onto working onto a Zelda title, it'll only be done in about 2 years. Why? The models and textures. The floors and walls. Enemies. Dialogue. Translating. Animation. Items. Plot. Story. Puzzles. Action. Weapons. Cinematics, AI, Etc. Nintendo focuses on them both equally, but out of all that, Mario only has Floors and walls, Dialogue, translation, models, items and AI. And a bit on Cinematics. Mario has been the same ever since, so they have about 1 year to make a Mrio game with it all been cut down.