In 2005, most previous and current champions of all of the racing series in Mexico moved into the series (with the notable absence of open-wheel champions, like Homero Richards), leaving other closed wheel series with young and inexperienced drivers, so the Desafio Corona decided to include those series in a supporting role.
As a result, many top racers from various Mexican racing categories entered the series in 2005 (with notable exceptions being open-wheel champions such as Homero Richards). This led to other closed-wheel series being relegated to featuring inexperienced drivers, prompting the Desafio Corona to grant them a supporting role.