Eh, Endeavor stomped Shigaraki, basically. Had he known about his multiple quirks Shiggy would be a goner now. As Shiggy himself would say, he now has max equipment and max abilities, but he is still on Level 1 when it comes to experience and mastery of his new power. He's just like Deku after he received OfA from All Might, he has all that great power, but realizing his full potential needs time. And after that time, both sides will be fully prepared for the final showdown. I wouldn't put it past Hori if he introduced a time skip now.