Pochettino is a good coach, Napoli have a strong squad. However, we cannot be satisfied with Napoli's performance. But often this team surprises us by performing well. But there is no consistency in their performance. Despite playing well against strong teams Tottenham and Manchester City, they dropped points in their last matches against weaker teams. Chelsea team needs more improvement. Chelsea's performance is likely to improve if coach Poch can build his squad with his preferred players in the next winter transfer window.
I don't know why you mention Napoli here. I think Chelsea need time to recover after they failed in the previous two seasons. Since Abramovich sold Chelsea to Todd Boehly, that's where Chelsea decline in the Premier League began, where Todd Boehly failed to make Chelsea stronger. Even though many players were bought at quite expensive prices, when they joined Chelsea their quality immediately dropped drastically.
Pochettino is indeed a great coach but he has not been able to bring his team to become champions in the Premier League like when he was with Tottenham. Well, this season Pochettino has a lot of pressure in his task of building Chelsea because Todd Boehly has budgeted a lot of money to buy players, so if he fails, of course Pochettino will most likely be fired.