Big 12 Tuesday mailbag: Texas Tech's concerns, nine wins for K-State?

In today's mailbag we chat Texas Tech positions of concern, K-State's chances of winning nine games and expansion (wait, no Shane Buechele questions?!?!). To submit questions for next week's mailbag, email me at bchatmonespn@gmail.com or tweet me @bchatmon.

@BChatmon what position do you think TTU needs to be worried about most? OL? RB? DL? DB?

— Cody DeRudder (@CodyDeRudder) April 19, 2016

Brandon Chatmon: Defensive line and defensive back immediately come to mind with the secondary as a priority spot for the Red Raiders. The talent in the defensive backfield is increasing, but Texas Tech will need to have a strong secondary if it hopes to surprise in the fall. Safety Jah'Shawn Johnson is a…