To date (unless I missed something) the Texans have had a total of one interview for 3 openings on their coaching staff. That candidate, presumably for the DL coaching position, Rod Marinelli was subsequently hired by the Chicago Bears.

There is no NFL policy against interviewing coaches for teams that still have upcoming playoff games.  The Jets are going to interview Cards OL coach Russ Grimm on Thursday in Arizona for their head coaching vacancy.  They already interviewed Giants defensive coordinator Steve Spagnuolo while the Giants were preparing for yesterdays game vs Philly.  The Jets have received permission to speak with Baltimore defensive coordinator Rex Ryan, but have not yet determined a day to meet.  

There is also no policy against interviewing a coach currently under contract as long as the interview is for a promotion, i.e. position coach to coordinator, coordinator to assistant HC or assistant HC to HC.  If the Texans are interested in Sean McDermott, the Eagles secondary coach, and have not yet contacted him then I don't know what they are waiting for.  If they promote Frank Bush without interviewing anyone else they look bad even if Bush is by far the best available candidate.  Any competently run organization does a minimum of 3 (preferably 5) interviews, for dog and pony show effect only, if they have already decide to promote from within.  To interview noone would look downright foolish.  In his brief tenure with the Texans, Rick Smith has not struck me as foolish.  Now I am starting to wonder.  Get of your duff and bring in some viable candidates for interviews this week.  You have 3 coaching positions to fill and indecisiveness is not your ally.

The coaching carousel is turning quickly.  Mangenius to the Browns.  Wunderkind Josh McDaniels , the 32 year old OC for the Patriots will take over the Broncos HC position.  I continue to ask myself what are the Texans waiting for?