With Brock now gone, the QBs on the roster are an oft injured Tom Savage and Brandon Weeden. The Texans will clearly be players in QB FA and I'd be surprised at this point if they don't sign either Romo or Cutler.
Everything still points to a first round QB even if they sign one of the two. I think the most likely available QBs when they draft at 25 are Patrick Mahomes and Kizer. Both need time to develop and with a few years behind a vet it might be Kizer's best hope destination. I'll tell you Texan fans would be thrilled to open 2017 with Romo-Savage-Kizer, seeing a competent group finally under center and hope for the future.