It should be like halo 3 where if you change your character into an elite you can play on any game in multiplayer as one. So if you change as an elite, your character will become a flood elite in flood
- Acquire elite multiplayer form.
- Find a flood research station.
- Grab a few flood spores and infection forms.
- Introduce them to the elite.
- Have them eat the elite.
- Design character models for elite infected flood while he is being assimilated.
- Play and enjoy.