Claremont is on record saying he begged editorial not to bring her back when someone (maybe Louise herself, or Ann Nocenti) took him out to dinner, got him drunk and then broke the news about her resurrection after the office switchboard was down for the night.
Said he almost quit over it, pitched Shooter using Sara Grey instead, etc. He hadn't wanted Jean killed in Dark Phoenix, but once it was done it was done for him. His treatment of the character from then on was passive at best, IMO. Partly bc she was mostly in other books, of course, but even when he came back he made a point to write a (bad) Madelyne closure arc in The End (a terrible book). I don't think he bears Jean any ill will today or even then really, but his sympathies and priorities back then were with the X-Men proper as well as Maddy, who he'd created, and what he felt Jean's return and the X-Factor pitch did to Scott, Maddy, etc.