Tunsil is basically the only starting caliber OL that the Texans have so I don't see them trading him. I think you ask for a 2nd for Lattimore and if you don't get it you keep him until the trade deadline. At that point you see where your season is. If you are still in contention for the division/playoffs, you keep him and trade him for whatever you can get next offseason. If not, you take what you can get from a contender that needs CB help. Of course, if Lattimore starts making noise and demands a trade that would change the situation.