Halo Infinite is one of the most ambitious projects Microsoft is developing right now. It is understood that 343 Industries is going to require a little outside help during this arduous development process, and apparently, one of the studies that is helping them is The Coalition, those responsible for Gears 5.
As reported GamingBolt, some workers from The Coalition include in your profile LinkedIn references to 343 Industries, where they worked for a time in Halo Infinite. Specifically, they were Adam Bodden and Hugo Gutierrez Mares who supported their colleagues in 343.
Bodden worked as a level designer for The Coalition until the end of last year, while Gutierrez served as a visual effects artist. His work within 343 Industries goes back to the single-player mode of Infinite, where they helped with the creation of cutscenes. So far, neither of the two studies has ruled on the matter.