I think people can get over excited about shiny new players before they even seet them.
Excellent case in point, all summer i was telling my RS mates wait and see Keita before they start claiming he is going to be a hybrid of Kante & De Bruyne in one player.
Look at him so far, brought in on a huge fee- the missing peice, and Milner, Wijnaldum & Henderson are still getting selected ahead of him. Why? Because they are all proven in the prem.
Now Keita may end up good in another 6 months or so and eventually get used to this league- he may not.
But to start putting players in your "starting xi's" who havent kicked a ball before you have seen them play in this league is asking for trouble.
By the way- everytime i have seen Ndombele he has looked ace (still dosent mean id have him straight in ahead of Gana, based on what he has done in another league, he would have to come in and prove it)