Well, I guess once Starlin had diversified to other publishers, he continued to keep the line open to alternatives, if things didn't work out at Marvel.
Starlin took his DREADSTAR series over to First Comics in October 1986. I asked him about that, he let on that Marvel was very slow with the checks in paying him, and that was why he took his series to First.
I recall Starlin writing and drawing 2 issues of BATMAN 402 and 403 (Dec 1986 and Jan 1987), right before the Miller/Mazuchelli's "Batman: Year One" story (404-407).
I stopped reading Starlin for a long time after his God-awful GILGAMESH series, and Warlock-re-tread INFINITY GAUNTLET stuff.
Although I really enjoyed the THING AND THE HULK graphic novel Starlin scripted with art by Wrightson.