Remove it because it’s just confusing for new players and I had to explain why it’s there to a friend new to halo.
I've been talking about removing it since Halo 5 launched. It was there before Halo 5 as a teaser, yet the story we got in Halo 5 is different than what was teased and the cut scene doesn't even make sense now considering how Halo 5 played out.
I've watched people playing the Halo series for the first time (well the old halos) and every one was confused because it makes no sense for it to be there. Their live chat feed though had to clear it up for them. It's absolutely stupid to have it their and makes zero logical sense. 343 will probably never remove it though, you're not the first to bring this up and every time someone does it gets shutdown.
If they absolutely have to keep it, move it into the Extras menu like where you can find Nightfall series and whatnot. Lol it bothers me than it should that they crammed in that Halo 5 trailer at the start of Halo 2. Is it there on the PC port? If so that makes even less sense cause Halo 5 isn't on PC