I don't think he is a better player than Cenk but also think that his skills and play-style suits better than Cenk, based on current Everton formation.
It doesn't mean that Cenk is a superstar or can do better for Everton. Also, it doesn't mean that he is an absolute trash. Give him a time to adapt and show what he can do, also give Niasse a little bit more of support. His talents are limited but based on my observations for the last couple games he is up to do his best on the pitch, he wants it. Looks like the arrival of another striker boosted his performance a bit. It is something by comparing it to some soulless players in the squad.
I have to say some criticism here I saw in multiple threads are sometimes really rude and impatient. I do understand it is mostly because of Everton is currently underperforming but still, it is discouraging and demoralizing.
If I were Everton manager, I would try 2 strikers up front and give both of them a chance to get along there instead of playing Morgan in the middle. It might work or not but worth to try.