IMHO Jett has the keys to this conversation. I would be a little surprised if they brought Pratt up anywhere near the big leagues until he settles in at AAA. Jett only needs a few good weeks of offensive production to be ready.
When Chourio comes back we won't be doing as much of the matchup stuff with opposing pitchers in the outfield ... so Chourio will replace Jones in all likelihood and then given Jett's ability to be in the grass he could replace Perkins and we wouldn't be losing the outfield depth.
So as we currently sit I think Jett is the only one who will bump Ortiz from regular at bats in the short/medium term?