When cenk played for beşiktaş, there were two effective left and right winger ryan babel and querasma. Those wingers supported cenk for scored and beşiktaş manager has offensive mentality and his tactical plan 4-2-3-1 but everton manager is conservative so it effects cenk's scoring performance. Cenk isn't classic striker not for only scoring. He likes to play with attacking midfielder as talisca and fast wingers. If you examine how to play cenk for beşiktaş you can see this, he plays to prefer outside of penalty territory time to time for assist to talisca and other wingers to score. So if your manager understand how to use cenk's ability, that would be great. I am sure that Cenk will be better and score more goals at future because he is very good striker.