I think the DBacks can find an option that better fits their team for Montgomery than a DH with limited power and no defensive role who is signed for 3 more years.
I could see Arenado coming to Boston (how prophetic of me after all the rumors), but I think more likely it involves someone like Whitlock than Yoshida.
The only deal I saw as a guy was Yoshida to Seattle for Mitch Garver, but that would require the Sox paying a good amount of money, and is unlikely given Yoshida’s shoulder. Garver’s deal is much shorter, but he was always a poor fit in Seattle.
In fact, as he is coming off shoulder surgery, I don’t see Yoshida getting dealt at all. I see him starting the season on the Red Sox injured list