I think a book can centre around jean grey and still be able to give other characters substantial interactions and development.
apart from the nova plot and Jean nation plot, the book feels empty. how are Remy and trinary getting along, Kurt and gentle, Kurt and gabby, why aren't these people talking to each other about stuff. it just feels weirdly empty.
but as I Jean fan, it's nice to see her in the spotlight ( just wish I could get her and storm having a real convo)