Cov fan here.
Gyok had performances last season where he looked miles beyond Championship level. His goal return is not a reflection on how good a CF he is. Some strikers will score you goals but provide little else, that is the opposite of Gyokeres. Though he's improving at scoring, and suspect this season if he stays he's bagging 25 goals. You only have to look at some of the Championship success stories in recent years to know that if you're consistently quality at that level, you can convert it to the PL. Crucially his energy and athleticism is PL level, and probably good at that. If Lampard wants to press he can do it with Gyokeres.