It doesn't really matter. That entire side is built around him, so it artificially inflates what he can do when he plays for them.
The problem is even if we did the same at Everton for some reason, I don't think aiming for the ability of Iceland is the ambition for us, and I don't think he has the pace and overall game to be an elite level playmaker, given he's flopped at every chance he's had above the level of a bottom half Premier League side.
Would love to be proven wrong but at this point I think we just have to accept that we overpaid by about £25m for a squad player, and was the pinnacle of the woeful transfer policy of Walsh and Koeman.