Like I said, I don't blame anyone for finding the pre-decimation series unremarkable enough to not look into. They're well written books, but the art was largely terrible and had next to no impact outside of its own pages.
He referenced the general amount of research he did for main characters in new series, and it seemed fairly sound. But at the end of the day NextGen is a Glob Herman vehicle, the NXM and other students are just supporting players of varying importance. I wouldn't be surprised if his only major research for most of the student body is largely from post-schism appearances. With that being said, I think he's treating them well enough for an alt universe series.