*I am not a lawyer, so take this response with a grain of salt. I would very much appreciate a lawyerpede telling me if I'm right, or correct me where I'm wrong.

My guess is that it gives congress the ability to pass a law saying another group can take the place of the cabinet in invoking the 25th amendment. I do not know of any restrictions on this group other than congress must vote on it into law.

I do not know of any such law that congress has passed, so it may be no such law exists right now and the only current way to trigger the 25th amendment is to vp + cabinet. But even if such a law has passed, the 25th amendment still requires the vp + the other group.

If it had to take a guess, assuming Pelosi was serious about invoking the 25th amendment and it wasn't just for PR, she is looking into if such a law was previously passed(again still requires vp + this other group), or writing a bill to create such a group that she know will try and trigger the 25h amendment.

Assuming Pelosi is writing a bill, it will have to pass through the republican senate before it can become law.. Even if a bill somehow passes the republican senate, GEOTUS will veto it. Even if SOMEHOW the veto gets overriden, vp would still have to agree with the group to trigger the 25th amendment.