Zhou came up from F2 to take the seat. The grid as a whole got quite jumbled by some big moves (me signing Ocon in season 2, signing Bottas in season 3, Merc signing Alonso, Alonso retiring, Vettel Retiring, Raikkonen retiring are the one i remember) so now we have such oddities as Aitken at Alpine consistently outperforming his teammate Gasly, Russell and Tsunoda fighting for wins with AlphaTauri, Williams and Aston Martin finessing podiums (Ocon and Ghiotto for Williams, Ilott for Aston Martin), and Alfa Romeo struggling to finish above P20 with Gio and Latifi.
That's a stark contrast from my 2020 save.
Bobcat Autosport: (NAME REDACTED) and Jack Aitken
Mercedes: Lewis Hamilton and Valtteri Bottas
Red Bull: Max Verstappen and George Russell
McLaren: Lando Norris and Carlos Sainz
Renault: Daniel Ricciardo and Esteban Ocon
Ferrari: Charles Leclerc and Anthoine Hubert
Racing Point: Sergio Perez and Lance Stroll
Alpha Tauri: Daniil Kvyat and Pierre Gasly
Haas: Romain Grosjean and Alexander Albon
Alfa Romeo: Antonio Giovinazzi and Kevin Magnussen
Williams: Nicholas Latifi and Nyck De Vries
Most of this is very similar. Kimi and Seb retired, and that's it.