Metroid is a secondary or tertiary IP, and the Metroid Prime subseries has always had more smoke online than its sale figures would ever suggest, with only the original on Gamecube selling north of 2 million, and it was a pack-in title.
Call it a bundle if you like, but the game itself was a packed-in the box and sold as an item with the GameCube, i.e. a pack-in.