I cant imagine a scenario where the Texans give up the 12th overall pick to move from 2 to 1. While I think they could pass on QB this year and wait for next years loaded class, the fan base wont allow it so I think if they have a couple of these guys closely ranked they will just take whoever is there at 2.
I think the likeliest trade partner is Indy if they do trade. Or the Texans too I guess, but I don't see it having #12 involved.