Leverkusen don't sell their players cheaply. He will probably cost around 60-70 mill which is what Benfca would want for Nunez. Yeah not being proven in a top league is a risk but the same could have been said of Diaz and he is doing fine at Liverpool. What I like about Nunez is that he is physically a monster and is not afraid to impose himself, but he is quite mobile too and can play effectively down the left wing as well as through the centre, so could be an option to rotate with both Son and Kane. Schick is more of a central striker.