Did they ever print a letter where someone guessed Hobby's identity correctly? (I mean as Kingsley, not Leeds, because everybody guessed Leeds.) I don't have a complete run from back then, but in 288 Alex Pogel thinks that Kingsley is the Rose; that's the only time he's mentioned in the letter pages that I've seen. Thanks!
Also - I like to think that Joe Robertson has known Spidey's identity since he and Captain Stacy were working together to try and figure it out, but maybe Stacy kept it from him, I can't decide.