Aye, if you put a guy with a bit of flair amongst a set of players who are a bunch of journeymen, you're going to see him do some great work on his own but with nobody on the wavelength to help him out. Result: Sessegnon shows nice skill and opens space but there's literally nobody around him to capitalise.
See some of the differences with Jonas this year (reverse pass to Ben Arfa), compared to last, he has much better options ahead of him for when he gets into dangerous areas.
Sessegnon would look a lot better in a team like ours. Other than him the closest thing they have to a flair player in midfield is Seb Larsson ffs.