If his tires are wearing evenly, it couldn't have excessive camber (I don't think). But toe could be off. I believe excessive toe in or out is what's meant by "dragging" tires. Could also be sticky tires (I don't know how sticky the Potenza line is), which wear really quickly.
I can also attest to the Conti DWS. They have been on my weekender Boxster for nearly 8,000 miles and show very little wear.
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