I don't think I'd accept a 20m bid for him tbh. I think his performances with us so far have been very, very good, and at such a young age.
His ability to hold up the ball is exceptional - I'd probably say even better than Benteke. He has the ability to run at defenders, beat them with skill and pace, and knows how to properly strike a ball.
He hasn't scored as many as he probably would have liked, but he's by no means a bad finisher. On some occasions, he's just got very unlucky or been stopped by strong defending.
He's a proper centre forward and he's still a kid. As Bruce would say, "he could be anything", and I genuinely believe that.