True. Two that come to mind are Lamela and Cuadrado. Both did/are doing really well in Italy but struggled here (admittedly Cuadrado didn't get much of a chance at Chelsea). Even Deulofeu can be sort of put in this bracket.He wasn't in this league. It really is a different beast.
Salah is fast but applying your pace here is difficult if you don't have the right physicality in your game. Hell, Magaye Gueye was described as "quick" when we signed him and he played like he was in slow motion.
I think Salah could be great for them but it is not a certainty by any stretch.