Alonso will retake the record of "most races started" next year.
IMO Russel is a Hamilton replacement but they need to see him against Hamilton as a reference. Same as what Ferrari did with Leclerc by using Vettel as reference as Leclerc was promising but still inexperienced. Russell never had a real reference at Williams, it was either Kubica or Latifi.
Now I wonder whos is getting the vacant seats at Alfa Romeo and Williams. Looks like Albon and Bottas are the top choices for the seat.