So basically what you're saying is that if Ober struggles, which we're all worried he will, Maeda can come in quick and relieve him. Why not just go with their best 4 starters? I think we can mostly agree the 4 starters we feel best about are Gray, Lopez, Ryan Maeda (in any order).
With Paddack and Stewart activated, this bullpen is stacked. Maeda will simply not be needed unless someone really struggles. Paddack and Varland can pitch multiple innings if something like that happens.
Twins are planning for a situation that might not come up and they're planning this because Maeda pitched great out of the pen 4 years ago. That's insane.
You start your best starters, Ober is a level below Ryan and Maeda right now and has no playoff experience.
And again I must end this with stating this only matters if they move on from the WC round, but if they don't none of us will care about this scenario.