As the Texans navigate their way through the early stages of camp, the big stories and question marks are obvious.

Can the revamped offensive line perform at an even mediocre level?

Do they have enough a running back if D’Onta Foreman is not ready to start the season?

Can J.J. Watt return to any semblance of his former self?

Will the rebuilt secondary help the Texans improve on last season’s defensive disaster?

And, most importantly, can Deshaun Watson stay healthy and perform at a level close to what we saw in his brief but magical run last season?

Fair questions all, and each has been and will continue to be debated until the season begins and likely beyond.

But perhaps the biggest question -- and one that seems to be flying under the radar -- involves the head coach, Bill O’Brien. Actually, it’s more than one question. Is he even the right man for the job? Can he improve some obvious holes in his game? And perhaps most critical -- is he even a good coach?

O’Brien’s record in four years is 31-33. Last year’s 4-12 disaster skewered the results somewhat after three straight 9-7 marks, but a four-year sample size is fair enough. O’Brien defenders will point to the revolving door at quarterback, which is fair, but he hand picked all of those players.

He came to town with a reputation as an offensive guru, yet his offenses have ranked 17th, 19th, 29th and 20th in yards, respectively. While not an all-inclusive stat, it still matches up with the other relevant offensive stats. Essentially, under O’Brien, the Texans have not even had an average NFL season offensively, ranging from slightly below league average to downright awful.

In addition, his game management has often left a lot to be desired. Conservative playcalling late cost the Texans potential wins against New England and Seattle last season, and that has been a common theme throughout his career.

His hires -- a major part of being a head coach -- have been dicey as well. Romeo Crennel was a terrific pickup at defensive coordinator, but “promoting” him last season so that Mike Vrabel could become DC was an unmitigated disaster. The Texans were lucky the Titans hired Vrabel to be head coach, because they could erase their mistake by bringing back Crennel.

Special teams have been awful every year. And George Godsey had to be jettisoned as a sacrificial lamb as offensive coordinator since O’Brien could not fire himself.

And yes, injuries certainly have played a part, but his reputation as a guy who could develop quarterbacks has been pure fiction.

In public he comes off as an arrogant, stand-offish bully, and he hardly paints a picture of stability. Those close to O’Brien say he is not like that, but his public displays scream otherwise.

Throw in all the leaked stories from his camp about other teams being interested in him to instigate a power struggle with former GM Rick Smith, and there really isn’t much positive to say about the man in charge.

Yet his offense under Watson was amazing, and gave the impression of what could be this season, hence a contract extension. He also has a new general manager in place that he is presumably on the same page with. He won his power struggle, and now is out of excuses.

Coaches, like players, can grow and develop. So far, O’Brien has shown little of that. Giving the defense back to Crennel should help on that side of the ball. Hiring yet another special teams coach may or may not help. Improved playcalling and game management in critical situations by O'Brien himself is a must for the Texans to be successful. This season will be critical for O'Brien to prove he is more than just talk and fake reputation and can be the coach Texans fans hope he can become.

Having said all that, coaches and quarterbacks get too much blame for poor performances and too much credit for wins. If Watson is what he showed us, he can cover up a lot of O’Brien’s failings.

If not, can O’Brien cover up Watson’s?

That might be the biggest question facing these Texans in 2018, and one no one is talking about.