The Texans have few needs outside D-line depth and a Starting Quality back . Getting D-lineman is a little easier than finding a "Franchise"type back . If I were GM I'd take a back Early in the draft and possibly pick up a d-lineman in the mid rounds or via free-agency .
Teams just dont let those type of backs get away due to free agency and to trade for that same kind of player would have a substantial cost either in draft picks or players at other positions .The fact linemen demand so much cash in free agency forces teams hands at those positions (just look at the Titanics in this years free agent perion , they lost Kearse and Smith because they couldnt afford them) .
Running backs also tend to have shorter carreer's overall , there are exceptions to this rule but in general they may have 3-5 years at the top of their games.
The starters on the D and O lines are pretty solid players , the glaring weakness of the Texans is production in the running game . they have 174 carries and 541 yards from their three backs . Thats an avg of 3.1 yards and just good enough to keep the opposing defenses honest . Overall they are 25th in rushing offense with an avg of 99.9 yards per game (counting QB scrambles and other non RB plays) .
Im not sure if the problems in the running game stem from the new zone blocking scheme , injury or just simply personel related . One way or another this is the one facet of the Texans game that must improve dramaticly for them to take the next step .
I do believe the Texans are in a position to take BPA where ever they are in the draft and dont have to draft out of pure need . This years draft for the Texans will be interesting to say the least.