Correct me if I'm wrong but I don't believe he had ever won an NFL playoff game as a head coach before coming to Houston. The year he won COTY was the 10-6 season with Washington in 1979 where they missed the playoffs because of giving up a big 4th quarter lead against the Cowboys in the season finale. He and Glanville were severely outmatched standing across the field from coaches like Levy, Schottenhiemer, Reeves, Noll, a group of coaches that combined for like 15 AFCCG appearances.
It's crazy to put all the blame on Moon, he was not perfect and certainly deserves some of it but look at the three ring circus that Bud Adams ran here with that Oiler team. Look at the garbage coaching on both sides of the ball. Look at how far the Run N Shoot fell from grace around the NFL by the end of the 1991 season, the 92 season, and going into the 1993 season. Look at all the drama surrounding that 93 squad. It was a lot of circumstances to consider, I mean look at that loss to San Diego early in the 93 season we were robbed because a blind referee ruled a game winning touchdown pass out of bounds when it was clear as day he was in. Had the refs gotten that right we would have been 13-3 and #1 seed in the AFC, we would have played the Jeff Hostetler Raiders in the divisional round instead of Montana and Marcus Allen, I'm sure we would have made it to the AFCCG in those circumstances.
I don't think there were many quarterbacks from that era better than Moon. I think he would have utterly dominated had he played in today's era with the way the rules are now. You look back at the state of the NFL in 1993 and it was crazy how good defense was across the league(I believe it was one of the lowest scoring seasons in NFL history in the 16 game era, almost every team had a lights out defense, I believe over half the league allowed fewer than 300 points, while you could count the teams that scored over 300 on one hand), it was crazy how much more physical the game was, it was almost a different sport entirely. Put Moon in today's NFL and he is better than just about everybody. He was definitely better than George Blanda, who played against sub-XFL quality competition those early AFL years(there was no such thing as defense in 1960-1961 AFL lol). He was better than a lot of other QB's that got into the HOF. Moon was easily one of the greatest of all time.