Former Dolphins quarterback Sage Rosenfels will serve as David Carr's backup after signing with the Texans in the offseason. Thomas B. Shea/US Presswire

Kubiak, 44, was a quarterback at Texas A&M years ago and has a lot of tough Texan in him. He was in Mike Shanahan's shadow forever -- for a year in San Francisco and 10 years in Denver -- so no one knows much about him. Complex he's not. Thorough he is. Very thorough. He's got a winning personality, but it can bite. He's not afraid of anyone and he doesn't let the little things slide. When he took this job, he told Carr, "Don't take it personal, but I can get real mad at quarterbacks.''

He didn't get mad the other day, but he got his point across. Carr was making progress in not boring a hole through his receivers when he dropped back from center. Kubiak worked with Carr during the offseason on slowing his frenetic pass drop and making him survey the field when he stepped back from center. Don't be in such a rush, Kubiak told him. See the entire field.

"Today I wanted to watch his eyes when he dropped back, because that's what he's struggled with,'' Kubiak said. "He's got [offensive coordinator ] Troy [Calhoun] with him at the line of scrimmage, then me downfield. David is really getting coached on every play.''

Ask those close to Carr, and they'll tell you he likes how he's being coached, particularly the maddening attention to detail. Ask Carr, and he sounds like a guy who really thinks he has a chance now, even though Bush isn't here to salvage a very troubled offensive backfield.

"I guess a coach can have two different philosophies,'' Carr said. He's now had two coaches in the NFL -- Dom Capers and Kubiak. "Dom's philosophy was, You're the quarterback -- you're the guy -- and we're going to surround you with everything we can to help you win. But he was a defensive coach, so he really couldn't give me any coaching points. That was left to the offensive assistants. Gary's philosophy is very hands-on with his quarterback. He demands perfection. His confidence in me has never wavered, but he also isn't afraid to call me out, which I think is good for me. It makes me feel more like I'm one of the guys.''

The other thing about Kubiak's impact on Carr is that he has told Carr he'll have competition for his job. Those are hollow words, you say, when the competition is Sage Rosenfels. But hold on. Rosenfels is a smart guy with a better arm than you think. Phil Simms calls him "the most underrated guy in free agency this year.'' Watching him inside the Texans' bubble the other day, Rosenfels threw hard and accurately. He should give the Texans a backup they'll be more comfortable throwing in there than Tony Banks or Dave Ragone. Clearly, though, if Carr goes down for any length of time, the Houston offense will likely go down with him. "A quarterback who can push David will help him,'' Kubiak said.

I still think Bush could have helped more. And now the Texans don't know if running back Domanick Davis' surgically repaired knee will be well enough for him to compete for his old starting job. Davis said the knee still hurts, and he has gotten a second opinion on why he doesn't feel right. There's no structural damage, but the Texans have kept him off the field for the most part in camp. Without Davis, Kubiak will turn to a mishmash of recycled and unproven and rookie backs, including Antowain Smith, Vernand Morency and surprising sixth-round pick Wali Lundy, who scored 52 career touchdowns at Virginia.

"Any regrets,'' I asked Kubiak, knowing full well the answer I'd get, "about passing on Bush, seeing all the problems you're having in the offensive backfield?''

"No,'' he said. "We did the right thing for our football team. We're not one player away, and we needed to start building a foundation on defense.''

Fair enough. We'll see if the Texans were right. I do agree that Bush would have gotten chewed up a good deal by defenses focusing on him because of the lack of other respected offensive weapons. But now Carr can do something about that himself. Let's see if he can.

"I guarantee Gary will have David go into the game on Sunday more confident about the game than he's ever been in his life,'' new Texans GM Rick Smith told me. "They'll massage the offensive game plan during the week and he'll feel great about what they're going to be doing by Sunday.''