Just because he didn’t draw the comics, doesn’t mean he didn’t do any work. He wrote the stories. He’s the reason you know who the FF and Spiderman are. Not Kirby. Kirby’s art is amazing, and he designed some (not all, not by a long shot) of the characters, but if it was all about his art, the New Gods would be a lot more popular then they are. The average non comic reading person has no idea who Darkseid and Orion are.
It’s the stories that made the FF, Spiderman, Hulk and all the Marvel characters what they are, and if it’s a character from the 60’s, Stan wrote the stories. Dr. Strange, Silver Surfer, Galactus, Kirby’s designs and Stan’s stories.
The images are iconic, it’s true, but without “with great power comes great responsibility” It’s not Spiderman.