Smith is still pinching himself.
"Getting an opportunity to learn from someone like that is incredible," he said of Robshaw, who is coming back from a dislocated shoulder suffered in his MLR debut in April.
"Just having him as a resource to watch film with, ask questions, be friends with as well … Being able to chat with him about life beyond rugby and what it's like to be a pro and an international player," he added. "There's so much you can learn from someone off the field as well. He's certainly a big part of that, too."
The 35-year-old Robshaw won 66 caps for England, captaining the side 43 times. But he isn't the only big name wearing San Diego colours.