I'd like to see Houck get a player like Tyron Smith to work with. Smith is the best offensive line prospect in this draft, I think. Houck hasn't had a blue or red chip player to work with during this tenure with Dallas. I think an assistant offensive line coach will help the offensive line, and Garrett can improve the coaching by adding a new voice and another set of eyes to the offensive line equation. That is certainly one class way to go about the situation.
Houck would still be involved for sure, but he can coordinate the running game and mentor the new coach. The personnel up on the offense is not in good shape at all right now, imo. That unit needs at least two new starters, and it needs Gurode and Davis to play consistently good. That unit needs to get younger, stronger, and more athletic, imo. Getting Gurode's and Davis' eventual replacements in this draft would be nice.
Second level blocking is an issue on this offensive line. If you go back to Felix Jones' time at Arkansas, their line blocked on the second level. Jones exploded right with them and was gone. Full back is an issue in that equation. Dallas needs better personnel and needs to get younger, fast. IMO. I'd start two rookies on the offensive line, and Smith would be one of them at RT. I'd take Smith at 9 and start him. By the end of the year and in the long run, you are setting yourself up for long term success. Plus, it forces you to run the football, and Dallas needs to limit Romo's attempts to 34, any way. The Cowboys should run the football and lean towards balance in their offense.
Campo may not be the DB coach before it's all said and done. He could stay on the staff, though. Time will tell.