You are biased though. He might be our most productive striker, but when he is off form, he is just wasteful and practically useless. He is a good striker, but definitely not one I'd keep around if an offer of 10 million came in. Like I said, every one of our attackers is up for sale, for the right price. I don't develop attachments to players, unless they are truly exceptional.
He has never scored 20 goals in a single season, and he isn't going to do so this season either. Hence, your argument of might have scored is mere speculation. You are hypothesizing based on stats, which may or may not hold true if he got more minutes. Perhaps he would've been as inconsistent and wasteful as Vucinic. We will never know. However, what we do know is that he has never scored 20 goals in a single season, and he isn't going to do that this season either. Simple.