They could be a random co-head if it comes to it and they want to bolster the top line.
They were pretty random in 2021, would be not much different nowadays.
Guys, RAYE is not headlining or co-headlining - it would be expliclity stated during the announcement. Obviously, it can change, if they fail to book another co-headliner, but I guess they already have one (that's why they announced MA as co-headliners).