Arbiter missions in Halo 3 ?

Were there gonna be Arbiter missions in Halo 3 ?. I can’t help but feel some of that plot line from Halo 2 was abandoned.

I think it was always supposed to be the way it is.

The Arbiter and Chief were together the whole time… I don’t know what you’re looking for.

All the levels are Arbiter levels in splitscreen or online campaign. Player 1 was Chief and Player 2 was Arbiter.