Didnt watch the arsenal game so have no idea how he was there.
Obviously, he adds intent when he plays. He is always thinking forwards and he is assuming he has players around him who think similarly ... which we dont Have seen multiple times in his appearances the no-look flick or pass into space where, in his head, there is a Kane or a Son already full-pelt attacking attacking the area. Then he looks dazed or confused or frustrated when he sees no-one going after it.
So there is obviously a lot of chemistry to be established, a change in mindset and tactics to see the best of him.
I dunno what his salary is, but if its ~100k or less I think he is worth keeping next season under the assumption Frank is gonna work on a new Everton for next season - one that isn't still under the shadow of FSW negativity. I would love to assume a more attacking team with DCL/Richy/Alli + one of Gordon/Gray as more established attacking 4 and a full pre-season to establish the rapport and chemistry and that would bring the best out of Dele
My impression of him (from the amazon series and other non-footballing clips) is that he isnt the sharpest tool in the box, a bit of a space-cadet outside of the pitch - he is good at doing what he does best which is linking midfield to attack.... but I dont think there is much scope for teaching him to play any other way or in any other style... he is what is he is and if the formation, tactics and surrounding players support his way of playing he will be really effective. If we don't want to play in a way the 100% suits him we should bin him immediately as he will just be demoralised and ineffective