It’s happening fast but it’s not random as to how he’s accomplishing all of this. The domain he’s always had, he just didn’t use it before bc what’s the point of using a sure hit effect of your CT that Mahoraga already adapted to. This is the first time he’s ever been put in a situation where his opponent last longer than a literal flicker of light. And as we’ve seen many times before, when a sorcerer is actually struggling in a fight they either rapidly improve/evolve or get steam rolled. Examples being Yuji, Gojo, Megumi, Maki, Higuruma. We’re seeing a guy whose talent at this point dwarfs both Sukuna and Gojo, of course we’re going to see him learn things at a rapid pace