Going from the worst team in a division to the best team in the division in one season isn’t as uncommon as you think. Could the Miami Dolphins do it in 2021?
In 2002 the National Football League realigned the divisions into their current format with 4 divisions in each conference. Since that time a team has gone from worst in their division one season to first in their division the next season in 15 of 17 seasons. In 8 of those seasons at least two teams accomplished the feat. In 2005 and 2006 three different teams were able to go from worst to first in their division.