I’m on board with keeping Olivera at second, which from all accounts seems to be his more natural position, if only to save stress on the throwing elbow.
I’m higher on Peterson than you, but I think even Uribe/K Johnson would be a measurable upgrade in the lineup over either Peterson or Gracia, and Jace would certainly still see PLENTY of playing time.
As for the Jace/Garcia question, I can’t say I’m thrilled with either full-time at third, although I’m intrigued by Garcia’s power potential. I’d be onboard. I just think there are better bats out there for third. The Braves are far more likely to sign a bat for third than second.