(not naming names here), he may start from the premise that it may be better to be dominant in some aspects of the game and below average to mediocore in others rather than well rounded at all levels. The NY Giants taught us that a dominant Dline can overcome lots, lots of weaknesses elsewhere on the D.
Conversely, the high sampling of top offense/bad defense teams in the playoffs supports the notion that dominant offenses can overcome not just mediocore but awful defensive play.
Where does all this take us with free agency and the 2012 draft for the Cowboys? Who knows. But a consensus taker like Jones (now I'm naming names) who follows even sound, good scouting is just a note taker to a visionary like Bellichek who saw how a two tightend offense can wreck havoc on defenses. I won't defend Bellichek's draft strategy as it is atrocious but I will defend his football acumen. If Bellichek had been an average drafter, he would have 5 - 6 rings instead of 3.
Back to Jones. Does he build a dominant offense with Castro and let the defense continue to bleed? Or does he add top talent to the Dline and trust his offense is still better than most defenses in the league? Who knows. All I know is any move we make is not the result of a grand, unified strategy but a year by year piecemeal of some fragment football fetish excerised by our glorious leader.