Dusty has been consistently great for a number of years, but not top 10. He has about 130 Brownlow votes already I believed.
I think you're downplaying Dusty's season as "just one season".
It was a perfect season - nobody else has ever done it. This gives his one season noteworthy credibility in these discussions.
To say he has been consistently great for a number of years is a bit much. He has been consistently very good for a number of years, and has had a great year this year. That is more accurate. If he has more great years he may catch Ablett jr. Anything is possible.