Preface: The A's always are in an odd place. They certainly could afford to deal with Olson and Chapman, but they each have 2 years service remaining and they likely need to do something. If they want to churn the roster, be a partner for them. You burn some prospect capital to do something like this, but you're also putting together something like a 6-7 year Plan. You put together the bigger package and you want a window to work out an extended contract. 7-year deals for both. There could be some perception value in superseding the Davis contract. Andrus also has 14M left on his last year of that contract. The Rangers are paying them 7+M from the previous trade and you can take the contract and leave the cash as part of the deal. It's a 21M opportunity for the As.
Trade: Olson, Chapman and Andrus for Mountcastle, Henderson, Herniaz and something else
For context.