Olivia may have agreed to sub but also be available to bump up, if someone else fell down. She is too big for it, but perhaps Sunday subbing to Stevie or Coldplay and then saving the headline slot for the first stadium tour would work.
Clearly she was way too big for Other Stage 5pm in 2022 - by rights she should have already been subbing the Pyramid.
The festival going for Stevie over here is so conservative that it's almost detrimental to the brand. The festival transitioned to the millennial crowd extremely well, but there's not very much to get excited about on the rumours if you're at 20 year old at uni - which was when me and my friends all became lifelong customers.