You don’t need to take my word for it. According to 93.20blue if pep is unhappy and lost faith in the guy that clearly indicates whatever good he does is outweighed by the bad he brings. He also mentioned that he is getting sold so...
The most causal analysis i've ever seen, doesn't take a rocket scientist to understand that Sterling's strengths are in movement, positioning and speed which is why he gets many more high quality chances fall to him compared to Mahrez who is a great ball striker but weaker in those other aspects. Sterling also creates more space for others with his runs and movement which we'd see the benefits of more with an actual striker in the team