Well, getting Gurren Lagann upgrades for the last stages... Gurren Lagann already is one of the stronger units in the game. Giving it the Super Galaxy form early would probably be a little too much... And also they decided chapter 40 out of 50 is when they start doing Gurren Lagann plot, and even then put it on hold for 6 or so chapters...
I know its 3 yo comment but yeah... SGGL can easily inflict 20k dmg with 1 att which if it enter game like mid game for pseudo evo and zero in v it will ruin the game... If u consider its TTGL form it will actually break the game
Black Noir went out like a pansy in V, but seeing that defective system get own by the sheer badassery and masculinity of Team Dai-Gurren will never not be amusing.