I'm a believer in playing the guy who gives this team the best chance for winning on any given night, particularly when this team has a real shot of making the playoffs. The Sox FO must believe that Devers is not as good as Marerro or Lin or any other that the Sox may have waiting in the wings. Otherwise, Devers would be up. That being said, what magic elixer will occur in the next month or two to bring him along so that he is a better player? Will he come up in September and be really good? The Sox FO would have egg on their faces if that turned out to be the case.
So, assuming Devers is not as good now as Marerro and Lin, and we know they are pretty weak players, what should the fo do? Let the team play on with a handicap at 3rd? Get a questionable experienced third baseman and trade away good prospects for him? Wait and try to pick up a really solid third baseman and pay through the nose for him after the AS break? The choices do not look that alluring. Others have suggested picking up a SS and moving Bogey over although that is pretty far fetched to me, that remains and alternative, I suppose.
I'm from the old school, which means when you have an obvious problem, you make an attempt to solve it. Lets hope the red Sox FO is thinking along those lines.