Eh I don't think Dolph Ziggler improved much. Dude's always been good. He's improved on the mic a bit (still isn't great at that) but I don't think his in ring work has improved. He was pretty good last year too I'd argue he's just being used better (ie not in the infinity loop with Kofi)
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I tried to have a fierce rivalry with SuperNiceDog, but he made me look worse than a GameFAQs Contest!