: I find it hard to believe that with a name like GuardianS and both on all the
: promo art, John will be sidelined. I hated the split campaign in H2, would
: much rather see a Locke and John campaign with one showing locations on a
: different scale of combat (ala ODST) or or with some type of plot device
: that turns the location previously visited upside down on it's head
: (similar to the second half of H1 with the Flood).
Microsoft comments: "As we've said before, Locke plays a primary role in Halo 5: Guardians," a Microsoft representative told Eurogamer. "The Master Chief remains an integral part of the game's story and as a playable character."

http://www.xboxachievements.com/news/news-19460-Master-Chief-Remains-an--Integral-Part--of-Halo-5--Microsoft-Assures.html