Tanks as full tank carrys

Just played a couple of arams. It seems tanks are a little bit overpowered. One game a full tank Shen outdamages a full ap Karma and in the next one a full tank Thresh does more damage than a full ap Lulu, full ap Shaco, full ad Jinx, full ad Zed. How can a tank do more damage than a carry? Is it possible that the balancing is slightly off? I'm just wondering why the LCS doesnt play full tank comps. Ok, probably the laning phase would suck but I'm pretty sure you could troll your way to Gold with a 5 man team. Edit: None of them built Sunfire. Thresh built a Thornmail and Iceborn. Shen built a Deadmans Plate. The other items were purely defensive.
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