It's more the Red X mystery felt like the weak link of the book to me. It improved once we got the flashback in the Yearbook special. But I would rather they revealed who Red X is in the issue than hide it.
This issue's flashback are framed through Diego's perspective. So maybe we'll get another for Marrissa and Lucas? Granted I think Lucas is just a buff teen than a meta.
DC continuity is pretty loose. So Jason as Red X could be set after his appearances in Urban Legends.