Hideki Konno's EAD Kyoto Group No. 1
Mario Kart DS (2005) ↔ Mario Kart Wii (2008) ↔ Mario Kart 7 (2011) ↔ Mario Kart 8 (2014)
Nintendogs (2005) ↔ DSi Sound (2008) ↔ Nintendogs+Cats (2011) ↔ New Project (2014)
Katsuya Eguchi's EAD Kyoto Group No. 2
Animal Crossing: Wild World (2005) ↔ Animal Crossing: City Folk (2008) ↔ Animal Crossing: New Leaf (2012)
Wii Sports / Wii Play (2006) ↔ Wii Sports Resort (2009) ↔ Nintendo Land (2012)
Eiji Aonuma's EAD Kyoto Group No. 3
The Legend of Zelda: Wind Waker ↔ (2002) ↔ The Legend of Zelda: Twiight Princess (2006) ↔ Link's Crossbow Training (2007) ↔ The Legend of Zelda: Skyward Swords (2011) ↔ The Legend of Zelda U (2014?)
The Legend of Zelda: Phantom Hourglass (2007) ↔ The Legend of Zelda: Spirit Tracks (2009) ↔ New Project (2012?)
Co-Development Team on a third Zelda? Wind Waker HD? Zelda 3DS?
Hiroyuki Kimura's EAD Kyoto Group No. 4
New Super Mario Bros. (2006) ↔ New Super Mario Bros. Wii (2009) ↔ New Super Mario Bros. U (2012)
Big Brain Academy (2006) ↔ Big Brain Academy: Wii Degree (2007) ↔ NPC: Pikmin 1/2 (2008) ↔ Pikmin 3 (2012)
Tadashi Sugiyama's EAD Kyoto Group No. 5
Wii Fit (2007) ↔ Wii Fit Plus (2009) ↔ Wii Fit U (2012)
Co-Development Team or New Team (???)
The math wouldn't lie. Average full sequel seems to be 2.5-3.5 years