I was thinking more of we sent Eris Morn and company first, which would explain us seeing hive on earth. Oh just thought, Prison of Elders should have been first. Then we meet the hive because of Eris. Which then leads us down the road of killing Crota, who IIRC opened the way for the vex? Either way we killed Crota, which would lead us into fighting Oryx. This is where I'm not sure. We would probably the Vex next go down that path and face Atheon. Which would give us better weapons than non-elementals. Use these more bada$$ weapons to beat Wrath of the Machine. Weapons from the raid aren't awful so it would make sense to go back to non-elemental primaries for Destiny 2. Then at some point get new elemental primaries to destroy everything. Just a thought I have had, I also have not studied grim that much.