Dale is in the booth today, but "only as a fan". Actually, he's keeping score as the statistician.
That's as close as he's come to the broadcast since April.
My guess is that he was tapped to be around in case Dave didn't return from his ESPN gig in Chicago last night. That's probably just idle speculation.
This isn't, though: Once again O'Brien has shown an heroic commitment to Red Sox broadcast duties. Rather than flying back from Chicago at the crack of dawn this morning, he could have easily met the team in Tejas. He chose not to.