Yes, but no one is suggesting that Santana be extended further than he is already signed. At which point he will be 35, 36 if he vests his option. If Arrietta signs a 5 year deal after this season, he'll be 36 in the last season of it. So, by trading Santana and signing Arrietta you maybe extend the window for this core of offensive players by a year or two. And that's if Arrietta is as good as Ervin, which is by no means certain. He certainly won't be as cheap.