Albeit, this new line of Arrancar is stronger, the Espada numbers still have the same purpose - ranking level of power. The group is composed of the 10 top-ranked, most powerful Arrancars. There is no point creating a different system when the Espada are considered the most superior of all Arrancar. Keep in mind that the Captains of the Gotei 13 had difficulty defeating the last line of Espada. Imagine how much different it will be when this line of Arrancar is more advanced? In other words, there is no point. I personally like the classics. [I vote for keeping the Espada system intact.]
Espada #0 is the weakest of all; Espada #1 is the strongest of all.
Fact: In the original series, there were two things forbidden in Las Noches:
1.) Espada were prohibited from firing a Gran Rey Cero.
2.) Espada ranked four and above were prohibited from releasing their Resurrección since their immense spiritual pressure had the potential of destroying the fortress.