Here's the way I remember it. The first time I encountered the work of Arthur Adams was the illustration of Snap dragon he did for the cover of Marvel Fanfare #13, but he really came to my attention in the letters page of #15, in which a fan wrote to complain about how Adams signed his name to that cover ("Adams"), which he refered to as a “low-down, cheap way of trying to see Marvel Fanfare.” He goes on to say, “Even if his last name is Adams, he should also sign his first name to avoid confusion for this cover was obviously not done by the great Neal Adams." Editor Al Milgrom pointed out the logical fallacy inherent in the fan's complaint: “If the cover was ‘obviously not done by the great Neal Adams’ where does the confusion lie?”
The very next time I remember encountering Adams' work was the Longshot mini-series, shortly thereafter. Other than that Fanfare cover, the artist was unknown to me, as was the writer, Ann Nocenti, so I gave it a pass. Then Adams was assigned to draw New Mutants Special Edition #1 and X-Men Annual #9 and I became a fan of his work. Then he was assigned to draw X-Men Annual #10 in which Longshot joined the ranks of Marvel's merry mutants. In 1989, the Longshot limited series was collected in tpb (not nearly as common a thing as it is today), so I figured I'd better buy it.
I bought the tpb in 1989... and then sat on it for 32 years without reading it! In 2021 the entire limited series was included in Marvel Masterworks X-Men v13 so I then had it duplicated! I quickly culled the tpb from my shelf, but I still haven't read the original limited series. That situation is about to change.