People think that a completely different team worked on Marathon.
Some fans of Bungie's work were unhappy that in the promotional materials for Marathon, the studio used the phrase "from the creators of Halo." Players questioned the correctness of this statement, suggesting that the team that worked on the original Halo had long since left the studio.
Project designer Elliot Gray responded to this. In a series of publications on his X social media page, he emphasized that such statements are not true. Moreover, the developer provided an impressive list of employees who participated in the creation of Halo and continue to work at Bungie, which includes about 40 people.
Among them are such experienced studios as Chris Butcher, Jason Jones, Lars Bakken, Tyson Green, Matt Noguchi, Dave Gaska and many others.