I don't need to write out my comments as you nailed what I'm thinking around the starting pitching. Our relief pitching so was unreliable last year and Baldelli put even more pressure on them by pulling starters before their 3rd time around the lineup. Sometimes, the heart has to be heard above the brain. You need a mix of the two.
I hope the Twins move Kepler for a solid relief pitcher or as part of a package to acquire another top starter. Celestino seems redundant as well since acquiring Taylor.
I agree with much of your thinking. That said, assuming the Twins package players to acquire a frontline pitcher, I hope they would then focus on keeping positions open for our youngsters. You can never have too much talent at SS and Correa does seem destined to play 3rd base in the next couple of years.