Alan Kulwicki was a famous underdog NASCAR champion with a more consistent than fast pace, but did you know that in the 1992 season in question, he never had more than 2 successive top 10's at any point in the 29 race season? The core difference to earlier seasons, where he already was fast but unreliable, was that the off days were still often yielding top 15's that were worth a respectable amount of points, keeping him in the fight. Elliott's win streak alone was 4 races long, and 6 other drivers, including Irvan and Earnhardt outside the final top 10, had top 5 streaks longer than Kulwicki's best top 10 streak.
Also, with Elliott having a wreck at the Daytona 500 and then winning rounds 2-5 while Allison won the 500 and gathered consistent top 5's in all of the following races, there was a point after the Darlington round where Elliott had won 80% of the races without leading in the points.