I find I usually agree with you and appreciate the way you try to analyze this stuff even when I don't (or, more often, can't decide.) I also get some guilty pleasure at your expense for some of the cracks sent your way by the weisenheimers. :lolThat is a good question - I expected to see it.
Yes, some follow is transferred to the OB for that shot. And since the first OB is momentarily trapped between the CB and the second OB (like a bank with the OB frozen to the rail), more than the usual amount of follow is transferred - but still not more than "natural rolling" follow. I don't believe that draw on the CB, even in the most advantageous cases like this, can ever transfer enough follow to the OB to equal rolling follow.
Also, it's not commonly known, but the OB is forced forward quite a bit in that shot even without draw on the CB - I'm told (by people who should know, like Bob Jewett, Ron Shepard and Dr. Dave) that it can theoretically be made without any transferred follow if it's hit at just the right angle (aimed at a point 1/10 of the way from the end rail center diamond to the corner pocket). I've never been able to make it that way, but I believe these guys, especially when they all agree.