One of the poorest article Zinn ever wrote. He failed to measure the individual cable pulls. If he had, he'd know that Campy 10 shifters pull only 2.5mm of cable for each of the first five shifts, 3mm twice and 3.5mm twice. SRAM shifters pull the same 3mm of cable pfor every shift. What that means is that after 5 shifts of a SRAM shifter, you have 15mm of cable pulled, but the RD only needs 12.5mm, so you have about one whole shift too much. That can't make for good RD positioning after only the first 3-4 shifts.