First - O'Hara books. Saul played massive role in preserving the knowledge.
Easily coulda repurposed that so the Revs were the ones that preserved the books.
You know? Actually giving SOME fucking importance to the organization that is supposed to fight against the WG?
Dragon was there in Ohara. So was punk. They coulda easily came to the same conclusion to protect the legacy of Ohara. Didn't need to be giants at all.
Second, Robin had harsh time until she met SHs. Lost everything. Saul being alive is good thing for her.
Sure it's a sweet moment.
But it's achieved at the cost of cheapening her flashback a bit.
Saul's final words to her were that she would find friends as long as she continued to struggle and live.
It's supposed to be a bittersweet moment when we come out of the flashback and the friends Saul said she would find, are there defending him.
But now, Saul is also alive and well. So the last words might as well have been "Survive for 22 years and we can reunite"
Third, him being alive would get tied to kuzan justice in the future.
Woulda been better if Kuzan killed his friend. And then that later on leads to his change of heart and his outlook on justice.
Instead, he merely thinks he killed his friend. Once again cheapening Kuzan's eventual departure from the marines.
Op already has a problem with fake deaths and constant revivals. But the flashbacks deaths were a bit more safe. Now even they aren't.