I actually asked Dave the same question about the torque arm mounts. You can see how my JRS setup did them in this picture (the picture is upside down, so the 2 tabs on the top are where the torque arm mounts):
There are bolts that go through the TA parallel to the axle tubes. Here's a good shot of those:
Looking at the pictures of Dave's setup, I think that he's going to use the mechanism that bolts to the pinion support to set the pinion angle instead of using the rods that go to the top. I could be wrong, but that looks like what the 2 bolts through the torque arm are for. Also I don't see the tabs on top of the housing for those rods like mine has...
I am curious why Jake changed the mounting points, but I'm sure there was a good reason...