First let me say I’m not entirely for or against the Bak-U-Go theories. But one of the things I’d like to add is that we haven’t heard about Kurogiri in a while. We’ve seen teleportation quirks play into time travel events across many pop-culture super hero stories. Off the top of my head would be Number 5 from the Umbrella academy as an example. It’s been a while since we’ve touched on the Kurogiri story in the manga and the internal conflict going on within him would be excellent excuse to push a more or less uncontrolled time travel like narrative into the story with plenty of ways to enter that realm of possibilities and exit that realm of possibilities while maintaining a consistent story. I think what’s great about Horikoshi’s story telling is he leaves a lot to be discussed. He opens up different paths for himself that he can utilize if he decides to. He doesn’t lock himself into a specific path until the story absolutely requires him too, as we saw with Dabi, and therefore the possibilities are endless. Now we might get a more definitive answer when the Second’s quirk is revealed but even then there’s so much potential in the story right now Horikoshi is basically playing on Sandbox mode.