Lately I’ve been obsessing over whether Giorno retained GER after the events of Part 5. Seems like the consensus is yes? Doesn’t really make sense to me, though.
Then I went down a stand arrow rabbit hole, thinking maybe that time Gold Experience cut its hand on Black Sabbath’s arrow was like one of those multi-part booster shots to prime him for the final arrow. That might explain why Polnareff wouldn’t retain requiem.
ALSO, I’m theorizing that it’s because Giorno and Polnareff are both natural stand users that they were granted requiem stands. Their stands weren’t created by an arrow in the first place like Kira’s (as debatable as it is that Bites Za Dusto isn’t a requiem stand…) and presumably Diavolo’s. I suspect this may be why full-on requiem stands didn’t quite develop for them.