Perhaps RB should have treated Ricciardo better and tried harder to persuade him to stay. Undoubtably Max is faster over a single lap, but he's also error prone and has big off-days. Ricciardo was winning races in the RB. He beat Max on points in 2017, despite having more mechanical issues (5 -4) and more grid penalties (4 -2). Max beat Ricciardo in 2018 in a season Ricciardo again had more mechanical issues. Mostly where Max has been stronger is qualifying, and dare I say it Helmut Marko's love.
Of the other Redbull drivers, Kyvat is the closest to Ricciardo beating him in 2015.
and also the fact that Gasly seems to do better in the TR now Alpha Tauri than the works car.