I think what's happening here is they want to sign Swisher to play 1B, keep Ells in CF into next year, and play Napoli mainly at catcher. This increases their concern about his ankle. And they have a history of modifying contracts (eg, Drew) because of previous injuries. One regret they may have is AdGon's contract, which omitted any provision about his shoulder. And Adgon hasn't been the same hitter he was in SD since his shoulder op. They were very lucky to get out of his contract.
The recent trades may have affected their thinking--they might see Hamilton as staying in Texas now, since Texas didn't get Greinke and Upton isn't being traded because the DBacks got their SS. That means their fallback, Swisher, may now be in play for them--which shifts their thinking somewhat on Napoli--more towards catcher than 1B. Hence, the increased ankle concern.
Just some speculation based on what I've read. They have a bunch of money to spend, and I think the value they see is more in Swisher/Hamilton than the pitching. Plus they now have several excellent prospects who could fit into the rotation soon. They are in a position to outbid everybody except the LA Fox teams for anybody they want--except maybe Hamilton, who might take less to stay in Texas.