: If I had to guess, I would surmise that this is a MCC-exclusive conflict as
: I've encountered other spawn glitches in my time spent on the game.
: Nothing as interesting or amazing as this, but I have had moments where
: entire sections of a map will despawn all enemies.

That certainly does add a finger of suspicion.

: I've also seen Two
: Betrayals spawn Banshee pilots outside of their banshees as they've fallen
: to their death and the banshees have been parked and usable

What place are you talking about there?

: really wish it would do this on Halo so I could use a banshee on a level...

You mean level 2? Elites can get separated from their Banshees there (I'm not sure if you knew that), but the Banshees can't be boarded.