Even the strongest chains have a weakest link.

OK, that might not technically be true if we're referring to actual metal, but it applies to every metaphorical chain in business, performative arts and, of course, sports.

Which links are weakest throughout the NFL? With a focus on position groups, vulnerable players and some coaches, here are the weak links to be wary of within every organization.

Arizona Cardinals: The Secondary

While the Arizona Cardinals have made major improvements this offseason, and while they should be expected to take a step forward simply because head coach Kliff Kingsbury and quarterback Kyler Murray are no longer rookies, the pass defense could remain problematic.