Here's my prediction on Olivera:
The Braves say he should be ready to come off the DL and start for the major league club in a couple weeks. I predict the hamstring injury will continue to be a problem, he'll have setbacks, and we wont see him until September. He'll get a little playing time, collect some hits, then get shut down for a minor injury for the last few weeks because there's no reason to play him hurt in meaningless games.
He'll come to ST next year and just rack up the hits. He'll wow everyone with rockets all over the field. However, late in ST he'll suffer some sort of injury to something like his wrist that will cause him to start the year on the DL. He'll be on and off the DL all year next year with a procession of minor injuries. He'll show flashes of talent and the Braves will call it a lost year.
His elbow will go the next year and he'll miss all, or nearly all, of 2017 with TJ surgery.
He'll be back in 2018 but his bat will have finally slowed. He'll play in a little over half the games, hit around .240 with 5-6 HRs.
By 2019 the Braves will be looking to trade him and they'll find some team willing to take him as a bench player with the Braves chipping in some extra cash.
I don't find this prediction at all unlikely. In fact, I find an injury marred career full of disappointment and underachievement to be the most likely scenario.