I've said it before I guess but I'm pretty okay with it. From a brand perspective, Power Girl is pretty separate from the Superman franchise anyway (though she now has a backup in Action Comics I believe).
I do hope they explain what the deal is with her and how her history within the context of Earth 0 played out. Back on Earth 2, it was Kal-L who found her when the Symbioship landed on earth and took her under his wing. Post-Crisis, it was Kal-El who found her, and she briefly believed she was his cousin until tests proved otherwise. Who found her in current continuity, since Superman wasn't around in 1976?
PG did debut before Superman in JSA (2023) continuity. But it wasn't her Superman. Her Superman got erased from existence as did her universe which makes her an anomaly.
As to the nature of the JSA's "return", if there's a relationship between JSA characters and non-Earth Two characters, then I think it's evidence that the JSA returned with their history (whatever it is this time around) restored. Flashpoint erased them from existence so that no one remembered them. Had they just popped up again, who would know who they were?
I’ll don the mask and wear the cape
If I am super, how can I wait?
I think Infinite Crisis established her as the Earth 2 Power Girl, having essentially fallen through the cracks in reality when reality reformed after the original Crisis. Unless that's been retconned since.
I have no idea who found her now though if she was around in the 70s.
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It was established just before IC while they were laying the groundwork for the restoration of Power Girl's Earth 2 history and relationship with Kal-L.
Post-COIE Superman found Power Girl's Symbioship. For a while she believed she was his cousin. Then tests proved her wrong, which made her depressed. The 'boob window' on her suit was symbolic of the fact that she did not have the S symbol, or any other symbol to place on her chest
Well, we still don't know how long before Superman's debut were the JSA still active. They need to explain when the sliding timescale now kicks in for the JSA.
But honestly, it really isn't that big an issue - especially if Power Girl was mostly restricted to Siegal/Shuster power levels. If the prior existence of Green Lantern or Flash or hell, Wonder Woman, doesn't steal Superman's thunder when he debuts, then why should Power Girl? It's not as though people would see Superman and go like "Hey...he seems to be the alternate universe cousin of that superhero who was in the JSA X decades ago?"
I guess "fallen through the cracks of reality" has basically become "temporal anomaly" now. Johns' approach to JSA continuity in general now seems to be substituting Multiversal stuff with time-travel/Hypertime stuff. So Helena isn't the daughter of Earth 2 Batman, but rather of Earth 0 Batman from a possible future (now seemingly erased). Power Girl is a temporal anomaly rather than a multiversal remnant. And so on.
From my perspective, Power Girl should always be connected to the original Superman -- who eventually became the Superman of Earth 2. That's part of her appeal -- the definitive link to the very first and arguably most well-known super heroes. Whenever I watch those old Fleisher movies, I can't help but think this is Power Girl's cousin in his younger days. I'm not reading this series and everything I read about it makes me glad I'm not. I don't get why Johns is doing what he is doing to Karen (not Paige) and Helena.
No offense but since you haven't read the current JSA you don't know what Johns has done to either character. For the record Johns isn't the one making big changes to PG. That's happening in Action Comics and other titles. As a long time PG fan I'm glad for the current exposure she's getting. So far, even with the added powers, nothing has happened to negate her connection to the Earth 2 Superman. In fact the whole push seems to be to tie her more directly into the Superman Family which I love. She's even wearing an S-shield on her jacket which I'm not 100% digging. Regardless none of that stuff is being written by Johns.