Some people forget he's 19 even though he looks physically mature. Not 22 like Sturridge. At 19, Sturridge was struggling for games and very lightweight. At 19, Welbeck was out on loan at Preston and nothing outstanding. At 19, Drogba had a terrible goalscoring rate in I think the French 2nd division. Dzeko was flogged for €25,000 at the age of 19 wasn't he?
Point being, Guidetti is not a finished product but for the age of 19 is a super prospect and doing far better than many strikers did who went on to become top class players. This is his first proper season in a respectable league and he has 11 goals in 12 games. He isn't lightning fast but isn't slow, has good movement and a good finish, he is strong for his age and is likely to become even stronger when he reaches his 20s. Playing around our three strikers could only make him a better player also.