What WOULD I do? I'd have Ober be the 5th starter and have Maeda pitch the middle innings. He has experience doing it (and excelled). Ober is a young arm that I really like.
But the writing is on the wall that Maeda will be the 5 and Ober will likely start the year in St. Paul. Ober has options left and they already said Maeda will not be moving to the 'pen.
Either way, we've learned every year that even if Ober starts in St. Paul he is pretty likely to make a start or 2 in April.
The starting pitching depth to me is - Gray, Lopez, Gray, Mahle, Maeda, Ober, Winder, SWR, Varland. And that's pretty strong depth if you ask me.