You just never know really. Football can be quite odd, history is littered with managers that failed at clubs and were then successful at others and vice versa. Sometimes theres just a “fit” and you get lucky. If you’re going by stats and win percentages, Benitez had a glittering CV but turned out to be one of the worst managers in our entire history.
Klopp at Dortmund had an unremarkable win percentage of 56.2%, Four managers since have comfortably bettered that (Tuchel 62.62%, Favre 61.82%, Rose 63.33%, Terzic 62.50%).
Pochettino had a horrendous CV before rocking up at Southampton, having a win percentage of 32.92% at espanyol and was sacked after taking them to the brink of relegation. Even the “great job” he then done at Southampton wasn’t all that great either if you look at the stats, a win percentage of 38.33%, Koeman then posted 48.35% etc etc. even Wenger before he went to Arsenal had win percentages of 28.9 at Nancy, 48.9% at Monaco which isn’t great for them, and a 56% in Japan.
Pereira’s record isn’t a bad one. His win percentages at his clubs are generally better than those he succeeded and those that preceded him. Look at Porto, his win stats are 69.89%.. those that immediately followed him,
Fonseca 56.76%
Castro 56.25%
Lopetegui 67.95%
Barros 50%
Pesiero 59.09%
Nuno Espirito Santo 55.10%
and the current manager has a slightly better percentage of 71.49% (Conceicao).
The same is also the case with his subsequent jobs by and large as well.
Look I’m not saying he’s the perfect candidate by any means and it’s definitely a gamble, but so are the others that have been mentioned. What I don’t get is this narrative that Periera is totally useless, he isn’t.