This is a really good article about who gets credited as creators of corporate comic characters like Wolverine, who receives the bulk of attention, but I was most interested to learn that The Cat's (Greer Grant Nelson) creators are credited as Roy Thomas & Wally Wood, not Linda Fite & Marie Severin.
For The Comics Journal @comicsjournal.bsky.social, I wrote an in-depth investigation into Roy Thomas, Len Wein, and the curious case of who created Wolverine. Featuring interviews with many of the key players.
The Marvel site doesn't list creators or writers on series pages, but the first issue page of The Cat lists the writers as "Linda Fite, Roy Thomas" while the comic credits list only Fite as writer, with Thomas credited as editor & co-plotter.
The Wikipedia entry for Greer lists her creators as Thomas & Wood, with some mention of Fite & Severin's contributions, but the credits in the bio bar read simply "Created by: Roy Thomas, Wally Wood" en.m.wikipedia.org/wiki/Tigra
Fite offered her memories of who did what in creating Greer in Back Issue #17. She says "They [Lee & Thomas] came up with the whole concept and then brought it to me" but then later states she "came up with the backstory and [Greer's] name." I couldn't find any info about who did The Cat's design.
Speaking as a reader & fan, I side with the position espoused by Waid & Levitz: editors may have been *involved* with a character's development, but they aren't the creators, because they didn't create the work. Pitching an idea or concept isn't the same as doing the actual writing & drawing.