I think that they're seperate weapons gameplay-wise, but in the game Rebellion will morph.so since osiris and arbiter are completely different weapons does this mean they did away with rebellion morphing into other weapons?
I'm pretty sure "Stances" is a synonym for "Morphing Rebellion into Angel/Demon-mode".DmC has three stances right? Human, Demon and Angel.
Human: Rebellion, Demon: Arbiter and Angel: Osris. So that tells us that when you switch from these stances your primary switching to different weapons. Which then means that Osris and Arbiter does not manifest in Rebellion through morphing but in their respective stances as separate weapons.