Stumbled across these radar plots for Zohore on Twitter just now.
I think the different metrics are scaled to show the values as a percentile of other players playing in a similar position. I.e. if that point on the chart is maxed out then that player is in the 95th percentile or higher of all players for that attribute.

Anyway, here's Ken's plot from last season.

IMG_20170817_083721.jpg

Not bad, especially considering for half the season he didn't look like a football player, and there were quiet games even during his good period.

Very low sample size, too low to be meaningful really, but...... here the same plot for this season.

IMG_20170817_083735.jpg

That is immense (against championship opposition), if his radar looks like that come the end of the season then there's no way he'll be playing for us.