I don't think Steel Panther are headlining now. That's a bad set of second stage bands though for me personally, I'd see 4 of them but only interested in three.
im assuming we are not counting posty as a rapper anymore as he does look likely but is definitely not a typical rapper against the likes of eminem or travis
I am hoping that if not Kendrick, then we get Eminem or Travis as our headline rapper this year. Can't really think of anyone else currently active who could headline R&L. I know Central Cee gets named a lot but I just cannot abide his music
To be fair they hadn't played RAR in over a decade either but they are next year. It's been 8 years since Hurricane too. I think there is probably a bit of acceptance at where they are now. They've started accepting some gigs even in England that wouldn't make then major headliners anymore.