JJR is one of Mr Murray's closest friends, is he not? Would guess they could be quite a good team. Pity that they have to meet Messrs Fleming and Marray in the QFs though, especially with the former defending so many points. And the sibling issues if both Murray pairs get to the finals don't bear thinking about! (Has that happened before?)
I doubt he would; sounds as if he's doing this to help out one of his best friends during a partner's down-time. Wouldn't really do to offer to help a friend only to let him down on behalf of another friend. Everyone's adult; one can only assume they'll all do their best and leave it at that.