Mauricio Pochettino is like everyone else. Remember that during his time at Tottenham Hotspur, the team never won a trophy and perpetually finished in second place despite the players' intense determination. Every single time Chelsea suffers a defeat in the Premier League, they continue with this trend. One of the worst managers in football, Frank Lampard led Chelsea through five games and suffered five losses with nine goals conceded and just one goal scored. It's shocking to see a prestigious club deteriorate into a young team who only started playing football yesterday.
I think you are way to hard on Pochettino to be honest. Yes it is true, that he has never won a trophy during his pretty long first stay at Tottenham but i also think that Tottenham is just not as strong as the other big clubs in the Premier League. So to say that he is not a good trainer just because he did not win a title with a team, is not really fair in my opinion. He even managed to reach the Champions League final with them in 2019 against clubs that definitely were stronger than them. So i think that Pochettino definitely is a great coach.
So i think he is definitely a viable candidate, now that Nagelsmann seem to already have declined the offer of Tottenham.
I think Pochettino is the right alternative for Chelsea at the moment. It's not easy to get the right coach when Chelsea's condition is down. Every world-class coach will certainly consider that the team he coaches must play in European competition, because it concerns his reputation.
Pochettino has never had success in England but I think he is a coach who really understands the conditions in the Premier League. Unlike Tottenham, Chelsea is a team that is financially capable and has a high target of becoming a champion. It's not easy for Pochettino, but if club officials give him time, he will be able to bring Chelsea back to challenge for the championship.