Roos for Ryan Mathews? Let's discuss

Player for player trades are pretty rare in the NFL. But it doesn’t stop fan from discussing them and it doesn’t mean there aren’t some that would make great sense.

In this Insider piece, ESPN’s Field Yates offers five trades that should happen but won't.

Yates’ deal: Ship left tackle Michael Roos to San Diego for running back Ryan Mathews.

The Chargers have a crowded backfield after signing Donald Brown to go with Mathews and Danny Woodhead.

Here’s what Yates said about why it would work for Tennessee:

“Signs continue to point to Chris Johnson not being back in Tennessee next season, meaning the team will need a running back to carry the heavy load. Mathews has dealt with numerous injuries during his career, but he was at his best with Ken Whisenhunt -- now the Titans' head coach -- as his offensive coordinator. Losing Roos would really sting, but Tennessee's running back depth chart is scary beyond Johnson right now (and not in a good way). Mathews, like Roos, has one more year on his contract.”

I’m going to disagree with Yates on this one.

What’s easier to replace, a solid left tackle or a running back who averaged 3.9 yards per carry?

The Titans will have a chance at Tre Mason in the second round and could get a player like Terrance West of Towson, James White of Wisconsin or Storm Johnson of UCF.

I’d rather draft that back to go with Shonn Greene and Dexter McCluster than need to find a left tackle to replace a steady pass protector like Roos.

For the Titans to make a jump in 2014, they need to keep quarterback Jake Locker upright.

They’d need to land Greg Robinson of Auburn, Jake Matthews of Texans A&M or Taylor Lewan on Michigan at No. 11 in the first round. Odds are at least two of them will be off the board.

I’m more comfortable with a rookie drafted outside of the first round over Ryan Mathews than I am with a rookie drafted in the first round over Roos.