Yaya didn't decline under Pep, he wasn't needed when we had Busi-Iniesta-Xavi.
Didn't say he declined. Read again.
Didn't play his best football under Pep. One of the many examples how Pep's not necessary or a guarantee to facilitate player reaching their ceiling
Lovern attain whatever a Dejan Lovren could under Klopp, played CL final, and the best football of his career under Klopp.
Utter nonsense. Lovren was terrible under Klopp, a constant liability that had to get subbed out in crunch games at 30 min mark (i.e. memorable 1-4 to Spurs) and club was desperate for Matip to be fit all the time
Lovren's best individual level was at Southampton under Pochettino. Way out his depth in Klopp system
Could talk about other players from that team just as well
Moreno played best football of his career under Emery right now before reinjuring
Kabak was a meme under Klopp despite being Bundesliga rookie of the season year prior
Plenty examples
Kroos was super fine and good under Pep, had he stayed more years I bet he could have been even better than under Zidane
Yup was fine and doesnt support the claim he was best of his career under Pep because he wasnt (in fact was better even in first season after he left) and null point to hypothesise he'd be better under somebody else as can't test and yet presenting it as fact.
Lewa exploded under Klopp and was good under Pep
And played the best individual football of his career well after leaving both of them behind
Manju was fine 1 season under Pep, then his club decided to bet on someone else for the CF position.
As above, played best football of his career after leaving Pep behind. Wasnt under him he was best
Clyne was great in the first Klopp season, then got badly injured and got faded out by the much higher ceiling TAA.
Yup as above, got hurt, got worse and got shipped out
Chygrinski was a wrong transfer, and as a B-tier player who would make only a benchwarmer he did the best he could do
Aye, played rubbish and Pep did nothing to his career despite asking for him and even wanting to keep him at the end
Didnt play best of his career under Pep either
Finally, Hleb and Goetze had their own psychological problems that they couldn't solve.
As above, not supporting thesis that players are guaranteed to play best football of their career under Pep
Great coaches are not a guarantee of facilitating player improvement even if you'd like to present it as such as fits your POV