was thinking about this.
before the trade, starting rotation was likely to be: Maeda, Ryan, Gray, Mahle & Ober.
Adding P. Lopez could allow the Twins to put Ober in the bullpen. He is certainly capable of throwing more than 1 inning at a time, and relieving might help him stay healthy.
I would rather have Ober in the pen instead of a guy like Megill.
as it sits now, pen looks like Duran, J. Lopez, Jax, Alcala (if healthy), Thielbar, Moran, Megill and Satan....excuse me, Pagan. Ober IMHO is better than several of those guys.
(side note - FanGraphs has P. Lopez projected as the Twins' best starter.......)