And that's just the top of the list!

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I subscribe to the hypothesis that time travel is cumulative. Even tho a trip to the Past creates an even IN the Past, that event does not occur until we in the Present (or Future) make it happen.

(I was introduced to this concept by Robert SIlverberg's novel UP THE LINE, in which the protagonist is a time guide, working for a company that arranges holiday trips to the Past. He notes that the most popular trip is "The Crucifixion Run," and that altho he has done this one several times, each time he does he sees only his past self, not any future iterations which might visit later [as viewed from his own timeline]. He also calculates that since this is such a popular run, the accumulation of visitors will eventually mean there will be more people on site than were living in Palestine at the time.)

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I inked Ditko several times -- three, I think -- but did not get to work with him directly, say, writing a story for him to draw.

The central point here is the word "collaboration", which to me means two or more people actually working together on something. That's really kinda rare in comics. Writers and pencilers often work together closely, but many times not. (Especially as we have seen a shift to writers producing full scripts. Many of those are handed off to a penciler without the writer knowing who it would be.)

Pencilers and inkers seem like they would be working closely together, but Joe Sinnott told me he had no communication with Jack Kirby during their time "together" on FANTASTIC FOUR, and did not actually meet until years after. Terry Austin and I had a similar experience, meeting only two or three times during our "collaboration" on X-MEN.