At the risk of provoking eye-rolling at the mention of a Captain America script treatment I created back in the 90's I nevertheless had a scene of present-day Cap visiting Bucky's grave and noticing the tombstone of someone named Jack Kirby. I had him pause and give a little nod before departing the cemetery.
That's awesome. But Marvel would never allow it, because it would admit they have no moral high ground on this.
Also, they're way too busy sucking on Stan Lee's overrated, over-credited old pole.