You truly believe his concussions are not a problem? If he stays healthy, sure, he will be fine. But one more, and he's got to start thinking seriously about the future of his family.
His concussions aren't really any of my business. Fundamentally, I don't think that it's the business or expertise of "journalists" or whatever you are to moralize about what a professional athlete--or really anyone--should do with their personal lives.
The angle that I would've taken is an indictment of the Arizona Cardinals front office for failing to be more diligent in screening Kolb. We knew that he had one serious concussion, and he's referenced in interviews this being his third. Basically, if the NFL is going to be serious about monitoring concussions, then teams should be wary of signing players with these histories. You kind of took a lazy, moralistic approach to this. You spend more than half of the column talking about the offseason--who is your audience reading the Bleacher Report who doesn't remember the courtship of Kevin Kolb?
My biggest quibble is with your headline, though. If what you're really interested in is whether Kolb should retire, then does it matter if ultimately Kolb is the "offensive answer" (which he's never been shown to be) or merely the below-average quarterback he's been his entire career? If he is the latter, does that change the equation of whether he should continue playing football?
What's more interesting to me is that even after his concussion with the Eagles and maybe getting his bell rung against the Washington Redskins (which I don't believe happened but many here will assert without evidence), that Kolb didn't go to the Riddell "Revolution" helmet that is designed to reduce the likelihood of concussions:
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If Kolb doesn't care enough about his neurological health to do absolutely the LEAST he can to protect himself, then why should I?