Klopps very good at making good players look world class. As much as I dislike him and his club, you’ve got to give him that unfortunately. How many of his Dortmund players looked like worldies playing for him in his system, then when they got a big move just looked meh.
I thought Coutinho was overrated too, he moved on and it’s proved to be so.
If Firmino moves on for big cash I could see him flopping wherever he goes. Very good player in the system he plays in, as an individual footballer? Decent and not a lot more.