Who is Sony's, Microsoft's and Nintendo's most valuable developer.

[MrT-Tar]

With Nintendo it is very hard to say as they have several 'massive franchises' such as Mario, Pokemon, Zelda, Wii... and Mario Kart.

I'll pick EAD 1 as it does Mario Kart and Nintendogs, both instrumental in the DS' success.  But I would understand if someone said EAD 2 or EAD 5 though.