Savio has been done for a while tbf. Think Fabrizio confirmed he was joining City months ago, just a formality at this point.
Olmo has been a weird transfer saga this summer. Fabrizio is saying we aren't interested at the moment, whereas DiMarzio is claiming that we're aiming to have a deal done with RB Leipzig this Tuesday.
Zubimendi would be a great backup for Rodri but can't see it happening sadly. He's been extremely reluctant to leave Real Sociedad/Spain (homesickness, apparently) and I don't think he'd want to play as a backup at the club level. So unless he can play alongside Rodri for the majority of games and you can convince him to leave sunny Spain for Manchester, it wouldn't happen.
Just pure speculation, but I think City/Txiki/Pep are looking for a 8/6 hybrid like Gundo was rather than a pure 6. Wonder if the Bruno Guimaraes transfer still has some life to it (fingers crossed).