Sarri previously did really well against Liverpool (aided of course by the awful fixture schedule Liverpool faced at the time), so I am a little surprised that Spurs won so convincingly. But it is true that the more respectable pundits have for some time been saying that Chelsea have been over performing and it couldn't last. As the season grinds on the thinness of the squad will take its toll.
Today's results fell nicely for Spurs and Liverpool. Man City don't care either way because they just keep winning. If Arsenal can keep up their momentum a fourth place finish starts to look a lot more realistic.
I think Sarri has done exceptionally well (surprisingly so, unexpectedly so) thus far. I had expected an improvement, just not one that was so pronounced.
Inevitably, he was going to meet a team that was stronger, better and better equipped, and that came about today.
Spurs were always going to find their rhythm; by their standards, they have underperformed since the season started, but that is understandable given the cluster of players they had on World Cup duty.
Re Arsenal, I think fourth place a reasonable ambition; it is within the bounds of ambition and ability, but Emery, like Sarri, will be doing well to achieve it, and may need more than a further transfer window or two to craft and mould the team to his liking.
I think the coming transfer window will be instructive for both Sarri and Emery; by then, they both will have a far better sense of what they need by way of positions and players, and who within their respective teams can adapt to their respective systems, (and who can be discarded).
Sarri's problem, as you have pointed out, is a thinly stretched squad, and, for that matter, I am not sure that Hazard will remain much longer. Having said that, Chelsea are still a very good team. It is just that they are no longer consistently best, or second best, in the table.
My money is still - as it has been form the beginning of the season - for Liverpool to offer a serious challenge.
Yes, they can't slip up - but, they haven't, to date; they are still in Manchester City's rear view mirror, and haven't been shaken off or cut loose.
Yes, as matters stand, it is Manchester City's to lose, but Liverpool have been pretty steady, and it is a rare pleasure to see Klopp's vision rewarded.