Merry preseason, everyone. It’s been a long offseason, but football is finally gearing up again and to celebrate I’m rolling out a new series on TSR entitled “2010 NFL Question Marks,” where I discuss one or two of the biggest concerns that teams have heading into the new season. Granted, some teams have more issues than others, but I’ll primarily be focusing on the biggest problem areas. Today I’ll be discussing the huge issues the Lions still have in their secondary.

A year ago, it was easy to spot the Lions’ biggest weakness, as their offensive line was an absolute mess. But after a productive 2009 campaign and a couple of offseason additions, Detroit’s O-line is no longer an issue.

Now the concern shifts to a secondary that received an offseason makeover, but remains the Lions’ biggest question mark after a dismal performance in 2009.

Last year, Detroit finished dead last in passing yards allowed, yielding 265.6 yards per game. The poor play of the defensive backfield contributed to the defensive unit giving up 30.9 points per content and over 6,000 total yards.

To address the issue, the Lions traded for former second round pick Chris Houston, whom Atlanta had given up on after signing big-money free agent Dunta Robinson. Houston has an impressive skill set and enough talent to make him a No. 1 corner, but he has yet to put it all together for an entire season.

The biggest issue with the former Arkansas product is that he always seems to put himself in position to make the play, but rarely does. He has great speed and is a physical corner, but he’s at his worst when the ball is in the air. He fell out of favor last season in Atlanta because he had major trouble locating the ball when it was in the air and making a play on it. In fact, 66% of the passes thrown his way were completed, which is a staggering number to say the least. That said, if he ever lives up to his potential he’s going to be a solid player.

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