I saw an article referenced on the Wall Street Journal's webpage and found the analysis to be interesting (but that may be because I am a dork). Basically, they use the frequency each columnist uses specific, unique words and then apply that to individual columns to see if they can determine the author of the different columns.
I think the most interesting part was the list of the top words and adjectives/adverbs used by each author.
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I like Kolins' art work, but don't think it's a good choice on a "mainstream" superhero title. I didn't think it worked on Flash, but I thought it really worked on the Thing mini that Johns and Kolins did.