User blog comment:Master Sima Yi/Assassinews 19-03-'14 – Two Assassin's Creeds for 2014?: Unity and Comet/@comment-4333212-20140322154117/@comment-13471981-20140323085218

Assassin's Creed III: Liberation was a numbered spin-off. They dropped the 'III' for the remake though, so I suppose your point still stands.