I'm not sure why people would expect any different from Fenrir. He's been a 'summon' in... what, one, maybe two FF games? (I remember him being in VI, and he may've been in XI but I didn't really pay attention to Summoner there so I forget), so that puts him on the same tier as Diabolos and Siren. At least this isn't something like Alexander.

Anyway, all that pushed aside; I noticed in the dungeon preview on the site today that Snowcloak doesn't have a prerequisite listed, while the other two are the usual "beat the main story" - which seems to suggest Snowcloak will actually be part of 2.4's story?