Jesus christ the point is he was great in the championship but has struggled to be nearly as effective at PL level. It's not like he had one great season in the top tier and then a quiet season the year after. It's yet to be seen whether he can replicate his championship form at PL level. If he could do so, then yes you have a top midfielder on your hands. But you could say the exact same thing about the likes of Tom Cairney or Jack Grealish.