Well since Seed Mode enhances abilities and mental awareness and all that mumbo jumbo, if you combine that with newtype abilites then that will make him A GOD of all pilots. Soon all other newtypes shall look like ants under the mighty shoe of KIRA YAMATO. Then I won't have to watch this show anymore if Kira is really a newtype. He will be like the fisrt Jedi. He won't just fry people's brains. He'll control them with his omnipitent powers. He won't even need a Gundam. He'll just make everyone kill each other.

Edit: If he has newtype powers it probably was part of the package of being the ultimate coordinator.