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Let's see you come up with a list of 60 players whom you consider top-pairing defensemen in the NHL, and then we'll see if your definition of a first-pairing defenseman holds up.
Perhaps you simply mean that Kronwall is not as good as Lidstrom. In that event, I agree, but it means nothing.
I'm working so I can't humor you beyond saying Ericsson and Bouwmeester are top pairing dmen. Kronwall wasn't a top pairing guy when Lids was here and he certainly doesn't look like one now.