Disney only bought Marvel because Iron Man in 2008 was a success and they announced the plan to do several movies which would lead to The Avengers. It was David Maisel, Isaac Perlmutter, Jon Favreau, Robert Downey Jr. and Kevin Feige who made that happen. Want to go back further, you can credit Avi Arad, Sony Pictures, Sam Raimi for the success of Spider-Man 1, which more or less bailed out Marvel. There's no direct connection between Stan Lee and the Disney purchase.
And fundamentally Disney makes most of its Marvel money from merchandise -- toys, stickers, backpacks, lunchboxes, costumes, cosplay gear. The movies...they are important for sure, but they're not the most lucrative assets of Marvel IP for Disney. There are babies born every day too young to see movies, but old enough to buy Marvel merch or have their cribs decorated with Marvel merch. And it's Jack Kirby's art on that, not any of Stan Lee's words. It's Kirby and Ditko (among others) whose work rakes in the moolah for the Disney Empire, that gives them their daily bread. I mean do you actually believe that comics are the first point of contact or reference for people when they are introduced to these characters?
There's far more direct connection between Kirby and Ditko (among others) and the bonuses and returns made by Disney execs than anything Lee did.