He apparently watched us for a the full year before coming.Hmm, would he be that cocksure? Coming into a Klopp team? He may have been cock of the walk at Leipzig or wherever, but his performances - and general demeanour - at Liverpool seem to be of someone crippled by self-doubt and shyness, rather than an arrogant "watch me, I'm the boss" type of Pogba-style bollocks.
I think that could be a huge part of the problem. He would have been imagining how he could slot in for us & what he could do.
Then he gets here, with all those preconceived ideas, only to have Klopp say "No, what are doing? You need to run here when he has the ball, move there when they have the ball, pick up that player if the ball is there, stay in this area if the ball is here".
Klopp & Pep constantly train the players based on a grid system, whilst both sides look fluid & flexible, it's all built upon them knowing where everyone else will (or more accurately should) be at every moment. This is the reason you can see our players making 'blind' passes successfully so often compared to other sides.
It's arguably much harder for a 'box to box' player like Keita & Shaq to adjust to that, just as it would be to imagine Gerrard playing in it (I wonder if Klopp would have Gerrard as a right forward for that reason?).
Tbh I'm not really that arsed why, just that those glimpses of class have made way to a much more consistent performance with those glimpses thrown in, & I have little doubt that he'll improve.