I mean think about it. The created and the foruners are taking over the galaxy (the convenant just glassed the most important city on Earth) Cortana using the Halo ring as part of her plan to do… something (Truth using the Halo ring to start the great journey). UNSC is finding a way to fight back both in halo 3 and halo 6. So if this keeps up we will get a full halo 3 for the new generation like just playing as Master Chief with Lock given a role similar to the Arbiter in Halo 3. Also another paralel that I’m seeing is that Master Chief is fight to get Cortana back, saving her like in halo 3 and if this keeps up then Master Chief might actually die unlike the ending in Halo 3 where we thought he died but it turned out that he’s still alive.