Keyword(s): Partially on the disc.
Reminds me of Mortal Kombat. People whined that Netherrealm sucked because Skarlett was on the disc (i.e. in cutscenes and in a background = fully playable character!!!!).
Then when Freddy Krueger was a like 300kb download = raaaage, Freddy is on the disc!!! (forgetting the patch they just downloaded, that included Freddy on it)
Like with many games, maybe it's stuff that was cut from the game because of lack of time and/or polish. Same way people found data of cut/unfinished stuff in Wind Waker on GameCube. Though we just accepted that it was just that. In this times, at least we can expect to see it at some time. Doesn't mean that it was cut with the sole intention of charging people for more things.