I don't think Madueke and Eze will elevate them as much as giving them the Premier League. Madueke especially. He is not a great player. He may be a good dribbler, but that's about it. He doesn't show intelligence on the ball at all, and I don't see how Arteta can use him to make their team better, other than the fact that he will be a good squad depth. Is there really a lot of difference between Madueke and Martinelli?
New environment and proper player management can bring about proper development and increase in a player like Noni Madueke. Too mee some convincing to see that too, he has the experience and skills, all he need do is to be consistent and hungry. There's always a possibility of a players rise to glory if he get to do things like these right. I believe he will be a successful player with Arsenal next season.