If anything the site proves my point. You're just picking a few stats to suit your argument but if you look at it in the grander scheme, Keita is in another sphere.
Going by that site he has a rating of 7.65 in an advanced midfield role (the position he will be playing for us). If this was Champ Manager (those were the days), with a rating like that i would be letting my interest be known. Sigurdsson with a rating of 6.88 which is a fair reflection.
Keita also ended up with a rating of 7.6 in the 16/17 season.
Looking at Fekir's rating for the season, it's at 7.86. Pretty incredible. As comparison, Salah had a rating of 7.48 at Roma.
I mean a site like that which uses advanced stats to compile a rating score has all of Fabiano, Keita and Fekir with one of the best scores in their respective positions in all of Europe.
Surely if you try your best to remove bias, you can agree that all the indicators are that they are all elite signings.