Let's provide a little context here.
Your assessment that Troy Aikman is "friggin' ********" is based on a single statistic you've unearthed regarding Mike Jenkins.
Have you considered that Troy Aikman -- as a former Super Bowl winner, the current number one color commentator for FOX, and a pundit whose opinions are widely respected and sought after -- might have an insight you don't, an insight that goes beyond the statistic in question? Is it possible Troy Aikman might have spoken with Mike Jenkins's coaches or might have access to film and camera angles we don't?
Humor me as I offer some wild conjecture here: When Troy Aikman says Jenkins "struggled in his rookie season", perhaps Aikman meant that Jenkins had difficulty grasping certain aspects of the defense and, as a consequence, was unable to be on the field as often as possible -- or perhaps the Cowboys defense couldn't be as dynamic as it wanted. Such struggles wouldn't necessarily show up on the stat sheet, and might explain why Jenkins was behind Orlando Scandrick much of the season.
This is all mere conjecture on my part, but I'm inclined to err on that side before I'll surmise that Aikman is a "friggin' ******."