Remove Umaro and Hidon???

You could do that, or you could just move the 86 3A command (which is what actually gives you the Magicite) and place it right after the text box, and then FE to exit the scene. Since the rest of the scene will never be called (and neither will the one with Mog talking to Umaro, because Umaro shouldn't appear. You might want to delete him there in the LE to be safe), you can feel free to do what you want with the space.