I think it had more to do with the writer at the time, than anything. He was really pushing Pixie for awhile. It wasn't to the same extent he did Scott/Emma and Hope, but it was there. During that period, there were three new characters getting the nudge for more prominence...Hope (to replace Jean), Pixie (who was written taking Nightcrawler's role on the team -- keep in mind, he'd not been used as anything other than transportation and Wolverine's confessor for several years by then), and X-23 (never to replace Wolverine, but more to try and cash in on the character's popularity). If the writer hadn't already made the choice to use Kurt as blue wallpaper and revert him completely back to the priest crap, it probably wouldn't have been perceived as an attempt to replace. Pixie's personality is kind of like a young Dazzler with a dash of Magik, and her visual is similar to Blink in some ways. Other writers had used Nightcrawler as more of a presence on the team, but the writer of the time really only pictured him to develop Wolverine on occasion, or as transport.
I can recall one mentor issue with them, and she was shown to exceed him in everything he tried to teach her, but experience.