To those mentioning Nolito and Bravo as failures.
I think the thing with them is that they were older, spanish speaking (to fit with Pep quicker) and more important, relatively cheap.
I think every player since these 2 have been a success due to Pep (Mendy being chronically injured doesn't count)
With Grealish, he is our record breaking signing. I think they put alot more care into his profile and determined over a long time that he was the player we need.
Another thing on creativity, something Grealish was known for at Villa, is that is often depends on chemistry with your team. Once he learns the system more, the patterns of play on where everybody should be, his creativity will come back in more.
Perhaps his future is also as an left sided 8/10 rather than a winger as well. Who knows, right now Pep is going to play him around for him to learn the system like he did with Foden and is doing with Palmer. He is open to criticism FOR SURE (should have scored), but at the same time should be afforded some leeway from the fans to learn the system.