The recent turnaround of Tottenham Hotspur under manager Ange Postecoglou is quite extraordinary. Even with Harry Kane gone their team performance has significantly increased. The previous issues were a group problem rather than just Kane mistake. Richarlison form has declined as a result of Postecoglou tactical changes which included switching Son into Richarlison position. Whether they can continue their title challenge is the current question. If they succeed it will demonstrate Postecoglou superb coaching. But strengthening their defence is still essential if they want to avoid making quick concessions. Tottenham performance will be heavily scrutinised as the upcoming season is expected to be full of surprises.
It is still too early for Tottenham to really be stable even under the new management of Ange Postecoglou. Because Tottenham will go through a long Premier League process, the twists and turns of the challenge will not be as smooth as at the start of the season. And if you look at the big clubs Man City, Arsenal, and Liverpool, of course this needs to be reconsidered because Ange Postecoglou is still in the process of testing Tottenham and you could say he is conducting an experiment, so he is not yet completely stable.