I don't know, a trade and a free agent signing are basically using two different resources, one uses prospects and one uses money, it's not like these two dis-similar moves are going to double down and deplete either of those resources extensively.
I guess my view is that if the Twins were to sign a big time free agent (Darvish is the only one I see as big time this year) you'd think it would indicate that the team thinks their window of opportunity is open now. Wouldn't you want to give yourself the best chance to win now? Why waste 2018 and only next year move to shore up the remaining rotation holes? Especially when there is a trend this year where the bottom feeders are open for business. I don't recall a year where this many quality arms are available for trade.
The aggressive teams aren't just making one move, they are making them in bunches and for the most part they are working in tandem.
And a very valid point. Does this mean the end for Gibson then? Do you think he's be part of a trade package for said SP or a BP addition?