Wong only wrote the Deadpool part, because that is leading into her Deadpool series, Vita wrote everything else.
I wish we could have gotten Claremont for the classic story, Simonson and Wells to write stories set in their runs, while Vita wrote the 'main' story set in modern day. Even a reprint of War Children or New Mutants #1 when they all failed their first Danger Room session would go a long way towards making this issue feel more like an appropriate celebration of New Mutants history.