Okay, how about a crazy theory:
Mark Webber is associated with Porsche, has been a brand ambassador since 2016 and the last thing he tweeted was about Porsche taking a stake in Red Bull. Mark Webber is also Piastri's manager.
It's not Ricciardo's seat at McLaren that Piastri is taking; it's Pérez's seat at Red Bull.
Possible but would Red Bull really ignore their own juniors again? Starts to make their own programme look worthless if they don't at least consider Hauger, Lawson, etc - I don't think they would put even Piastri straight into a Red Bull seat either, its just not their style not to put their juniors into AT first in recent years.
Summer break should be interesting though, I expect we should have almost all of the grid nailed down by the time we hit the track at Spa in just over 3 weeks time.
I do have suspicions that there's more going on at Alpine than meets the eye, Alonso going, Piastri looking to have chosen elsewhere, Prost left because he couldn't work with the new CEO (Rossi) - for a team that's 4th in the table and performing well they're making a Ferrari scale arse of this, I can't blame anyone for looking at McLaren, their car might not have been quite there this year but they're nothing but professional.