Comment 5 for bug 602176

That didn't sit quite right with me, so I noodled on it some more.

The second pad doesn't actually contribute to the heat transfer profile because it's on the other side of the zone. The only factors that control the heat transfer to/from the pad are the number of spokes, the spoke width and the spoke length. Essentially the antipad distance controls the length of the neck-down (ie: the spoke).

So the anti-pad area shouldn't exclude spokes at all (whether on the same net or not -- net-to-net isolation is specified by the zone clearance distance not the antipad distance).