I don't know rc, or joshu well, so I could be way off base. But it seems it's doing a large # of the right deals, and all that follows from it. He seems to be in most hot deals, and so he's now developing a personal connection with all the major angels and vcs, as well as of course all the founders of the companies he has funded. So soon he'll be able to draw on this network, and that seems to be what rc is able to do.
joshu is not unique in that regard- there are many other angels also executing the conway shotgun strategy. The main difference is that he's doing the deals under his own name instead of setting up his own "fund".
