Here is an interesting conspiracy I came across myself
All big Zelda and Mario games released within a year to each other
Mario Sunshine - July 19th 2002
Wind Waker - December 13rd 2002
Twillight Princess - November 19th 2006
Mario Galaxy - November 1st 2007
Mario Galaxy 2 - May 23rd 2010
Super Mario 3D Land - November 3rd 2011
Skyward Sword - November 18th 2011
Wind Waker HD - September 20th 2013
Super Mario 3D World - November 21st 2013
Mario Maker - September 10th 2015
Twillight Princess HD - March 4th 2016
Breath of the Wild - March 3rd 2017
Mario Odyssey - Oktober 27th 2017
(New Super Mario Bros. U Deluxe - January 11th 2019)
Mario Maker 2 - June 28th 2019
Links Awakening Remake - September 20th 2019
Super Mario 3D World + Bowsers Fury - February 12th 2021
Skyward Sword HD - July 16th 2021
The Legend of Zelda Tears of the Kingdom - May 12th 2023
New 3D Mario - ???