I don't think he's world class or ever was. At the end of his time at Everton I think he was a very good player, and that's why PSG came in for him and he was a pretty good player for them overall.
He's not the same player now.
Players can be decent you know, and not have to be the very best of the best.
There's many, many, many players who are that level and have played in relatively poor teams. Look at Rice at West Ham.
It was a relatively cheap fee to bring him back and his wages are less than what Allan was on. However, FWIW, it would have been nice to see us go and firm up interest in someone like Tyler Adams, who is exactly what we should have been after.